Somehow considering resale value on a $15 game never really crossed my mind, but then I'm not one to sell a game for a handful of dollars unless I just want to dump it because it's that bad.
About $20 (about two movie tickets or a round of pints) is the point at which I almost don't care how much "value" in dollars per hour I get for my money if a game is playable enough for me to want to return to it more than a few times.
I prefer to buy DD PC games through Steam and resell value on any of them has never been a factor (although technically, licenses can be "gifted" to other Steam users), mainly because there really isn't much of a market for used PC games. At that point, people usually just steal them online.
What's nice about DD games (depending on the platform) is that you have access to them on any system if you are the type of person who owns several systems or often play on systems owned by someone else.
As for the PSN DD system, it's really easy to abuse the hell out of it (installing on five systems owned by five different users) making the games practically free if you have a decent PS3 network of friends. I'd say that SCE's system is generous to the point of being flawed.







