Originally Posted by BankShot
I trade in most of my games when I'm done with them, as I don't do multiple play-throughs of most of my games.
I used to do this, too. The last game I traded in was Sleeping Dogs, and I really regretted it, so when PSN offered it as a free download for subscribers, I went for it again.
Some games are definitely not worth a 2nd play through, but I give a few of them a play through or just pick up where I left off just to see if I can edge closer to 100%. I never have done it for any game, though.