Digital games? Right, right…
Well we can't all afford dics. I have to either go into town and scour the place for games they probably don't have, or buy them second hand off the internet. I feel like I'm kind of cheating the developers by buying second hand games, and there is usually a long waiting period before I actually get the game. And with the amount of games I've been getting from PSN sales and PS+ I am getting GOOD games at a faster rate than ever before. I may never finish a game with 100% completion again 
Speaking about digital games, I've deleted all of those M-rated games, because I don't want my brother to play them, and they were just demos.
Can't you just password-lock games that are to "mature". I know I can on the Vita, and probably on the PS4, so possibly on the PS3 as well?
I don't like to keep demos anyway, they are good for me to play once or twice, but by then I know if I want the full game or not so I'l delete the demo and either buy the full game or leave it.