Playing just for trophies? Truth is, I already am.

I'm currently replaying Uncharted: Drake's fortune in light of the trophy update. I've been having a blast with it. Trophies are just like achievements, you should consider them challenges from the developer, and as you earn points and 'level up' your profile, that's like an online leaderboard. It's healthy to be competitive, and it can be the little push you need to play games through or to try certain weapons out. Trophies and achievements were a brilliant concept, and I will certainly use them as an excuse to replay games when the time is right.
Now, where are my MGS4 trophies..?