I am just always looking for an easy solution and if this data is not saved I, have no problem doing the leg work myself but nearly all the games in my library were purchased while they were on sale, I was looking for a way to see how much money I have spent on each game and sum total, that does not involve manually adding invoice totals from emailed receipts. This seems like the kind of data that may be compiled and available to the owner of the account.

*In case there was confusion as to what I was truly asking, I wanted to clarify.
Some video game broker websites, like GoG, offer access from your own account to something along the lines of... Transactions>Payment>History. I don't want to mention any crappy DRM loaded competition here in the forum but I have seen this tool available from other distributors. Manually adding all the emailed invoices together was really not that big of a task but features like this are commonly available and access to the information is not always obvious to the casual user. Thanks to everyone that chimed in to help!

While GOG does have access to your receipts, I'm not sure how easy that would be. Best thing I can suggest is making an excel (or equivalent) file with your orders, payment per order, and total spent. You could always add a second excel with the current value of your account so you don't feel that bad about how much you have spent.

Well, you need the prices at the given time for this, and as long as GOG doesn't provide them on the website, you have to do this manually. If you can get your payments as .xls[x], .ods oder .csv file, you could filter the data in a spreadsheet.

And GOG has no interested in showing you how much you have already spent here ;)

Try support. They might not be willing to give you a detailed breakdown of your purchase history, not easily anyway, but I can't see an issue with just a lump sum from their records.

Not that it helps you now, but I keep a file with all my game records: title, price, date of purchase, website, login and password, keys and codes, gifts and presents, etc.

I think that the hard part about getting the prices from the time that the game was bought is that he might have bought the games quite a while ago, and might not remember the prices of the games when they were on sale. Now I haven't been here long enough to seen how the sales work, but I'm pretty sure that games go on sale more than once and, depending on the time, at different discounts. I hope you are able to find the data you're looking for and good luck on your search.

There should still be a receipt in your e-mail, assuming you do the proper thing and keep them. GOG support can resend you the receipts, though they prefer to know which one to send, especially if you have made a large number of transactions.

Googling should at least provide th discount for common promos, e.g.
site:gog.com intitle:company "game name"

Edit: Of course combined with the date range set.

When I did this, I just exported my mail into a text file and used some Perl to calculate the total.

I had to laugh at this - while I don't keep quite that much information, I did recently complete a full list with source and play status. I also keep a separate list for gifts available, gifts given and gifts received. Oh and I have a separate email file if I'm ever motivated to update it with the ungodly amount of money spent...maybe better if I don't!

Just felt like doing it again and made this quick graph. Not sure why the legend broke on exporting to an image though. Probably something to do with how I overrode it..

Blue (B) = Gifted
Red (C) = Purchased (sometimes by mistake :P)
Yellow (D) = Total

And yes, it is a "GOG-style graph"!

It sounds more complicated than it is. It's just a simple text file that I update whenever I buy new games. The primary reason is that it's easy to forget what you've bought, or the website you bought it from, or what password you gave a year ago to login.

I don't always immediately download what I buy, and if I didn't have some kind of record, then those games would be lost and it would be money wasted. The cost helps me compare with current prices and whether I got the game at a steal or if I was a poor shopper. It also helps me be grateful to those who've given me things. I have Realms of Arkania 1/2 on my shelf that I got free a year ago. If I hadn't written it down, I'd never remember that it was Starmaker who generously gifted it. I make sure I remember people who gift me, and who I give presents to.

It's also handy sometimes if I don't know what kind of game I'm in the mood for. I can look at the list and go, "oh yeah! I forgot I own this game, lemme play it now." Remembering you own a game is like getting a surprise gift.

I also have the names of gifters and giftees! ;-) I also to to keep notes on gifts received - was it my first ninja? Yay! And for example, YellowAries literally insisted I take a game because I'd been so nice to him - those details make me happy to look back at when I play those gifts ;-D

I don't really think GoG has anything to fear from angry consumers in pain over their lack of self control. But I thought this may have something to do with why this information in not easy to to access from the website. Personally I think it is more a matter of... Why would they waste time and money building into their database a feature that will not in turn generate it's own revenue.