if you know you tend to spend money on stuff you are not going to use, then why not go to a PS4 or X1 and go retail?
why choose Steam/PC and their "sales!" as your gaming platform when you know you are gonna fall for it?
So a game is normally $19.99 but today it's $4.99, you bought it. Congrats, you flushed $4.99 down the toilet.
by the time you have, say, 70 games (which is alot, I'd stop buying at around 15 or 20), why not stop buying?? what's the throught process when you know perfectly well you own 150 games and you're about to click that button to spend money on another 3 games you don't have time to play?
serisously I don't understand some of you guys. And I am not trying to come off as arrogant or harsh, I just don't understand :/
At one point I had an epiphany that I'll only buy a game if I wanted it and intend to play it for >3 hours literally that day. So I don't buy too many games now and never preorder, which is good. I also avoid bundles and only add games to Steam that I actually, genuinely see myself playing to completion. This even goes for games people give away in the Steam thread.
Before that, I had an epiphany that I'll only buy games that I'll play in the next few weeks. Ended up thinking I'd have far more free time, and things like work or a book or a TV show would get in the way. Less free time as I grow older. At one point, I was making a little bit of money on Steam cards, but now those aren't worth as much. So, previous game purchase behaviors don't really work - that results in some surplus game purchases.
Before that, I bought literally anything I had even the remote interest in, because PC game sales were new and exciting and bargain priced. (This was from 2009-2011) Holy shit a full AAA game for $5? I'll take all 20. Humble Bundle? It's for charity - each game is like, what, $1? Might as well subscribe to PS+ in 2011-2013 too - dozens of AAA PS3 games delivered right to my console.
You don't think about how the behavior is going to scale. It's not like this has any real consequences, you think to yourself, you just have more games now. The money spent is a pittance compared to amassing a collection in nearly any other hobby. They were practically giving games away.
Your suggestion of physical buying and selling doesn't solve the problem, if the problem is you're buying too many games. It's the mentality. If you buy a game, don't play it, then sell it, you're still probably out quite a bit of money - usually the amount the game cost on PC. So you spent the same amount but with nothing to show.
Getting rid of the backlog is actually the bad move here. That's also not a bad thing, either, to suddenly realize you own 200 games that by all indications you would enjoy a lot. It's freeing in a way. I'm currently playing Batman: Arkham Asylum GOTY for the first time on the PC and having a grand old time. It's a great game! Not as polished as something recent, but that's OK. I'll play it until I'm done with it (which may not be the ending of the game). I'm also playing Bioshock 2 and it's solid. I'm surprised I never got around to it, but hey, it's a fun game and it's there. Why would I let Gamestop rip me off on those?
Once you start delving into your own backlog it kind of feels like a perpetual Christmas. You're always satisfied and happily surprised. I really enjoy just sampling a game for an hour and moving on - but it's crazy when a lot of those games you like to sample stick around forever and some of them are really fun, you just have to make time for them. That can be overwhelming, which is why people joke about their own backlogs with anxiety tinged words.