Lol at my collection. most of the games that I buy is either a "non-trophy" game, or a game that's not in the database of PSN's trophy library.
(Like my "So-JApanese "games, it's not even in the main PSN database lol
ex: Tears To Tiara GAiden, White Album PS3)
But the gamer cards still displays my Trophy amount perfectly.
About trophy collectin, yeah, it's fun, but I'm not that commited to it.