How about for signing in (once a day) you get a free spin of a wheel that gives you a chance for weapons(or other items).
Daily wheel
Mar, 04/24/2012 - 18:10
Mar, 04/24/2012 - 19:35
#2
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Login, get nothing. Find a new account. Repeat.
There's a similar thread already.
You want to make it like a facebook games?