What's the point?

I feel dirty. Last night I spent an hour of valuable gaming time playing the godawful Fusion Frenzy 2 on Xbox 360. Why? Yup, you've guessed it - easy gamerpoints. Microsoft's achievements system is genius, so clever that Sony will be creating their own version for PlayStation later in the year. The obvious benefit for Microsoft is that people will buy more games to increase their score, even crap ones if they can easily be mined for points. Word spreads quickly about games with easy points - and it must be very tempting for developers with lesser 360 games to add in some simple achievements just to attract sales. That's the certainly the case with Fusion Frenzy 2. Perhaps more interesting than the marketing pull is the way achievements can encourage different playstyles or simply make you experiment - Crackdown is the best example of this with numerous challenges that you simply wouldn't bother trying if weren't for the potential points reward. Forget HD, gamerpoints are the real definition of next-gen. So, anyone else want to fess up? Ever played a duff 360 game just for the points?