I don't buy games that require net activation to play or re-install. GOG is not one of these. I buy and download the install files and can play, install and reinstall it without having to log into GOG and ask if I can freakin' play what I bought every time I use it.
These days when people talk about DRM they are usually only referring to the annoying net dependent type, such as Steam or what EA now uses. I have no problem at all with disc checks and cd-keys. Never has this method made me unable to use a game I bought. I remember the outrage with Starforce, but I never experienced any problems with it in any of the games I bought that had Starforce in them.
If all these games that require net activation didn't have it,.. then I would probably consider buying them.
Net activation is a hassle. Maybe not to you,. but it is to me. So they are losing sales to me and other people who don't like it.
ALSO about used games. GOG is cool because they've managed to be able to re-distribute older games and have them be compatible on new systems.
But there are plenty of older pc games that have not been re-released. I often buy these used off of Amazon. A lot of these games were made by devs that don't exist anymore. Some of them were published by publishers that aren't around anymore. I'm glad I'm able to play these old games that aren't available as new anymore.
If game publishers keep making their games inconvenient to use with overly restrictive DRM and calling their consumers criminals then I have no problem at all with not buying another of their games again if this is the attitude they present to us. Video games are not something I can live without. I have no problem with not supporting certain companies within industry if they treat me this way.

No, not for me. My computer is average, thats all I need to know, so unless I'm buying the latest super graphics game, or a 1995 game, I don't even need to look at the box at all, or research it online, unless i get a problem that requires support. Otherwise it's a waste of time to "research" it.

Computers vary in many ways - CPU, RAM, graphics card, hard drive size, operating system, etc. Drivers for different graphics cards are also issues to take into account. Because of this not all computers are the same, so you can't just pick up a game and expect it to work great like you can with a console. If you don't bother checking what the system requirements of a game are then if something goes wrong or it just won't run then you've nobody to blame except yourself.
And anyway, checking system requirements only needs a very little bit of research. A little bit extra can tell you about OS and driver issues you might face as well as the reliability of the game itself.
Also, I don't believe that there is ever such a thing as a truly average computer because of the sheer number of different computer setups and also because the technology is moving very fast - bigger hard drives, faster CPUs, more CPU cores, better performing GPUs.
Edit: And yes, nowadays there is the need for research into what kind of DRM a game has, what with the evil SecuROM and limited online activations. Last thing I want is for bad copy protection software to conflict with my DVD-RW software or something similar, or to end up stuck with limited activations of a game.

My experiences with online activation hell are from Mass Effect. Since I was moving to Win7 and wanted to remove it before, I did it "traditionally" with uninstaller. Just after that, I remembered that it had that silly activation limit that I should revoke first. Ok, download EA tool and get on with it... BUT! It didn't want to function because I had already deleted it. It gave some obscure error about service not functioning correctly so that didn't help much. I decided to try to REINSTALL the game to get rid of the activation... I hadn't even finished installing when the revoking thingy started to work again. Was it due to reinstall or the error thingy getting fixed, I have no idea... Anyway, got the activation revoked and decided to avoid games with that sort of "copy protection" (and EA games too). Too much fuzz to get simple things done. Quite disappointing...

where is my post? :(

Hey thanks man...wasn't aware.
Good to know! how is GoG better exactly?

Well, after you buy a game on Steam, you need to check in with Steam every time you want to play it. (yes, there is "offline mode" but that has its own issues)
When you buy a game on GoG, you can download an installer that doesn't depend on an internet connection to function; you can copy it, move it, redownload it, do almost anything you want to it with no issues. (you also get various extras that Steam doesn't offer)
I'm not fond of online activation for all the aforementioned reasons, but I also have dial-up, so no matter how "simple" they make it, I'll probably have an issue. With GoG, I download the installers anywhere I can, put them on a flash drive, and bring them home; it's wonderfully convenient! :-)

You keep your download (back it up just in case though) and it does not require the internet to be able to use the installer. You can install it time and time again from the installer you download when you purchase the game.
Also, there is NO DRM at all in the games from GOG. No CD checks, no online activation (well, there are the odd ones which need a unique key for online play, but that's just to identify you as using a unique license, and GOG provide these on request if you need a key; offline play does not need activation).
GOG is cheap and has offers every single week with a very simple pricing system.
Download speeds are very nice so they can clearly handle the bandwidth at present, but then you'd expect that from any digital distribution site.
You don't need to install a client to download the games from GOG either. There is one available if you wish, so that you can pause and resume downloads, but you don't have to use it if you choose to download a file in full in one session.
You get lots of extra material with the games on GOG, such as wallpapers, artworks, soundtracks, avatars for forums, the manuals and any reference materials, that kind of thing.
Regular competitions to win free games from the site.

GOG also makes sure games run on Vista, while some games on Steam don't work on Vista at all.