Max - make it exclusive by charging folks to post. Set it up in a tiered fashion: 4.95/yr gets you 3 sites, 9.95 gets you 7 plus the ability to vote, 19.95 gets you unlimited sites, etc. Partner up with Paypal. This will weed out the sleestaks who are wasting your time and bandwidth (or at least bleed their parents out of some dollars you can use). YTMND is some of the best free entertainment there is, but it's plagued with sites made by turds, about turds. Serious players will be willing to support you.