Guys you do know it's illegal to ask someone to buy something (support your site) in order to enter a contest, right? Every ad for a contest you've ever seen on tv, on the radio or in print will mention "no purchase necessary" and it will give you some other way to sign up that doesn't require anything. That includes anything that might benefit you like "likes" on whatever and signing up for a newsletter that you use for any kind of advertising at all.
I'm not trying to be a jerk here but you could end up in trouble with these rules. There has to be a way to enter that doesn't benefit you in any way. I suggest you check out this web page because what you are doing is essentially running a lottery and that is illegal unless you have a license from the state to do it and that isn't likely.