I myself may need a support group, because whenever a sale happens and I have disposable income I have a habit of becoming unleashed, despite my having other concerns (work, university, caring for aging parents). I thought that I could keep my purchasing habits under control here on GOG because of the lower game library and the (even lower) availability of games for OS X but judging how my library exploded from freebies to 20+ (fourteen games purchased during the recent Summer Sale) so far it hasn't been the case.
Since the late 1980s every gaming console I purchased eventually had an enormous library of games to go with it, all of them played at least 30 minutes to three hours, many of them unfinished (from the Atari 2600 up to Playstation 2). After the Wii, my penchant for having at least 30-50 games minimum per console tended to drop thanks to the ease of computer gaming.
Steam made my gaming addiction even worse, and if it hadn't been for the constant software issues that the Steam app created for my machine, I would have probably accumulated 200+ games, with about EIGHTY of them untouched due to time constraints. Just like here on GOG, if I see a worthwhile-looking game on sale, I have the annoying habit of buying it now to play about six months later. Those games would eventually be played for a few minutes, and then shoved back on the virtual shelf when another item appears on a sale.
Before giving up Steam (for hardware and personal reasons) I had about 168 games, but only five that I played religiously (Colossal Order's games chief among them). Many of those games were purchased when I had older, weaker hardware (a modified Mac mini), but I assured myself that once I purchased newer hardware I would settle down and play them. I finally purchased hardware which greatly exceeded the softwares' various requirements (a 27" iMac), played those previously-purchased games...and placed them back on the shelf when new sales game along, only to continue playing the OLD games. When I decided that I didn't want to use Steam anymore, I reflected on all of my previous purchases...and decided that I wouldn't miss them.
Now using GOG Galaxy, those former Steam-based purchasing habits have surfaced again, though I'm making it a habit to actually invest more time to COMPLETE the games despite having so few free hours. Still, it's rather worrisome that this behavior persists. I assume it's reasonable to pick up games on sale now to play later as it saves money in the long run, but it's the persistent behavior of the sales that would deem this behavior objectionable. I DO pick up full-priced games once in a while, but when THOSE get added to my backlog, THAT'S when buyer's remorse kicks in.
Just a few minutes ago I purchased Trine 2: Complete Edition (it was on sale and I liked the first one); unfortunately it's almost four in the morning as I write this and I need to get more sleep. After getting up two hours later to run errands and catch up on international news, am I going to actually play Trine 2 on my one day off? Or am I going to attempt to finish Freedom Planet, continue with Pier Solar, or reattempt to understand the confusing controls of Sim City 2000?
Game sales. A blessing and a curse.
superstande: Hm. Maybe you are right... not too different. Some people were collecting lots of games, most of them which they never played through, at least until a lot later. But at least I remember people giving serious effort to games that were bought. I think that part of it is age demographics. There still are a lot of young people who dedicate tens of hours a week to gaming, and finish quite a few games. There are also a lot of older gamers who don't play as much as they used to, a demographic which was a much smaller percent twenty or thirty years ago. 
