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Because i like the Game/s
... i ran out of new Games
Simply to increase the Playtime of every Game.
To keep up with Friends/others
To increase my E-peen, noob
A bit of everything.
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As for myself:
If i really enjoyed a Game (like Fallout 3, Demons Souls), i want others to tell that, and the best proof is to achieve simply everything in it.
additionally, there's always some kind of competition for me. I'm not a trophy/achievement whore, but if i REALLY like the games i played, i want to be equal (or even better, by achieving everything) with Friends. :)
but dont expect something big, there are just 4 Games i completed to a 100% so far. (So its Answer 6 for me.)
.. and you guys :)?