Building a member base by signup

Job description: - building up my members/signups base - as a signup it requires a unique username, ip address and an email address (quick&easy no email confirmation) - you don't have to be active as a signup - required fields when you signup: :: username :: password :: verify password :: referrer (which I'll supply for tracking project) :: name :: email address :: accept terms I am looking for someone (individual or a team) to build up member base to over 50,000 members for a very low budget. I require guaranteed signups at a very low price, as my site doesn't generate much profit to support the high cost of purchasing regular guranteed signups.