Depends on the startup business model. I work in the "enterprise space" and at my last company, and the one I am just starting this is our plan. We are actually in discussion with two major enterprises who will help fund our initial development through NRE and invest.

This is possible since we are talking 5 figure sums, where the legal hurdles and time negotiating are worth it. IF the sums of money are small, this would not work.