You're welcome to host a contest like Mark from DotSauce, however effective immediately any incentivizing of every signup will not count towards your referral numbers. We're getting too many people offering money in exchange for signups and the quality of the applications are largely inacceptable. If I wanted everyone offering money for signups, I could have done that myself... Please be creative about how you go about getting signups and make sure the members you recruit aren't just after a quick buck.