Size absolutely doesn't matter , graphics assets take way more space than sound or game features, every game could add 4k+ texture packs into it , that wouldn't make them better while size would skyrocket.

$/hr main content based on howlongtobeat stat is a good indicator for story/adventure games with clear endings.
I think most of my games are not those kind. Open games/multiplayer games can be played for way longer.
If you would buy games only based on this, then you would miss out all the great stories.
League of Legends is free has no built-in story, you can waste hundreds of hours easily. How could any paid game compete with that?

Best would be the enjoyment you get from the game, but that is subjective, nearly impossible to measure.

I think just dont buy what you won't play in the near future is a good start.

I've seen so many people just buying games, play it for 1-2 hr then write positive review how awesome the game is and never touch it ever again on steam. Their review is clearly false and they just wasted their money on it.
These people just buy the games from ads/social pressure. I think they have no personality, don't be like them.

Their spending while increase publishers income, make a bad habit to tailor games to have good advertisement and nice content for 2 hours and forget the rest as the low attention span gamers will jump to the next one.

How do you guys know how much you spent on games...

Money spent on GOG: Too much? ;)

I've already resigned myself to never really being able to tackle my never-ending backlog. Even with buying less games than I was, it still grows at a faster pace than my completion rate. At least I have plenty of games to choose from should I feel like playing something completely different when the mood strikes. *shrug*
Painstakingly calculate it by copying one's order history? I couldn't be bothered doing that with ~1400 games.

Remember when GoG introduced the profiles, forgot to tell everybody that visibility needed manual opting out and, for a brief time window, basically made all statistics of all users publically available?
Pretty sure there were quite a few users with +2000 items in their library, so no, you're not the most frugal person on GoG.

My family spends very little and so it's pretty easy to track stuff. My parents started me very early on budgeting and savings. It so much easier now with cell phones to take photos of receipts and upload them to a sheet.

there are even apps for this , they are not that good thou

I don't call it spending, I call it "strategically investing in the gaming industry"... ;-)

I have the same question.

Also, I buy a lot of gift codes, so simply parsing the orders probably wouldn't do.

None of those apps are worth the time. I have a simple method of taking a pic of the receipt (if it's on paper) and storing it in a folder based on the type of purchase it was - food, clothing, home, tech, entertainment, medical and misc. I use the upload date and time to auto sort then just add them to a spreadsheet through out the week when I have time if my wife has not done it, yet.

The only good thing apps are good for are keep track of rewards, cash back and e-points.

I've been like this since I was a kid so it's pretty easy for me to track all of my spending. I have a bunch of gift codes that I store in folders also on my personal cloud and home server. My kids also dump stuff in there like unused portions of their gift cards, steam keys, gas cards and coupons that refresh monthly.