i think thats the issue. if they were physical copies of games i would be seriously concerned for all the unplayed games (so 300+) taking up space. but since its all digital its a lot easier to ignore or oversee. Plus with humblebundles realeasing lots of games for a decent price its easier to say yes. back in the day your options were like the budget labels like Soldout, sierra collection, GOTY editions etc. But they never were that frequently and quite selective. through in supply/demand issues and it made things harder to acquire for your gaming collection.
That said, being from a poor family, me and my brothers had to democratically decide which game we were going to get. We would probably play at tops4-5 games a year and usually nothing full price so £20 tops. obviously if it was part of a bundle 3 for 20 that was ok, but again, we had to "democratically" (majority rules) and decide.
As i got older with my disposal income and ebay and flash sales, screw moderation, i could buy the games i wanted for a knock down price compared to RRP.
Atm i only have 4 games installed (minecraft, chivalry 2, Path of exile and Anno 1404)buy t i do have a load of Roms and Doom wads on my pc so you could argue i have a lot more. I play one or 2 at a time so that they get my full attention and ensure i finish them. it can be boring at times, but as long as i pick/buy games i want or have a high score i should be fine.