Alright, here is the idea:
1. Everyone signs up for that Metro forum.
2. Earn bullets (Posting in threads, uploading stuff, whatever).
3. Dump all bullets to one account (Mine, for instance :P).
4. Raise 10500 bullets, exchange them for a copy of Metro Last Light with Luster.
5. In the meantime win this (http://www.lastlightforum.com/showthread.php?t=105). If a lot of peeps participate - we get a higher chance.
7. Profit (At least two free copies of M:LL).