I think you're overstating your case. So far, you haven't been put in a position where you had to deliver functional code of some form to win a bid for a project. Give it time.

If you're doing so well right now that you wouldn't even contemplate going out of your way to win a particular client, congratulations. I understand that's not an uncommon position for dev firms to find themselves in in 2010-2011. Just understand that the pickier you get about who you want your clients to be, the more work it will take to acquire those clients.