If you would get value from people signing up, just testing your services you'd probably be better taking the money you would use to buy the ipad and posting on

If you would get value from people signing up, just testing your services you'd probably be better taking the money you would use to buy the ipad and posting on Mechanical Turk. You'd then get a good number of people to sign up to use your service, they could even do a screencast of their interactions, how they navigate your services and common places where users get stuck. Asking and paying for direct feedback will be far more useful than buying users with no interaction requirements and hoping for some meaning to arise from your stats. Least after the testing is done you can purge your system of the testing accounts and then you know who your genuine users are.