perhaps state that on the signup page, so people don't bother, then? there are identical sites that actually exist already, so why would anyone be interested in signing up here?
edit: to be clear, I mean: there isn't value in "testing a market" when the market is already tested.
as this is focused on a slightly different segment with different "users" than what's already out there (established startups and companies vs new startups), we figured we test the market and get some feedbacks from both side of the market to test if it's needed/wanted and how it should function based on both side's wants, needs and objectives. It has proven very useful to define beta features as well as to help us develop a vision around it