Maybe you should have them bring a bank statement before you talk to them or even better yet, come with a pre-approval from a bank I understand what your saying too. I am looking at it as if I were selling the car, which means not as a buisness. If it were my business, I would only spend my time with a guy/gal that is serious. I work for GE and thats what we do. We put out a lot of bids, but only focus on the ones that we really think were going to get.