I don't disagree with you guys; if the seller is unreasonable in their expectations, then absolutely don't waste your time when the chances of you logging the sale are slim. However, in your shoes, if you had the opportunity to bring a car to BAT that was highly likely to sell (low or no reserve, reasonable seller, etc) my advice is not to get hung up on the $...get it done, log the sale, build the credibility. Once you've got a bunch of sales to your name, then by all means, ask top dollar for your services.
Adi, your comparison to someone trying to sell you a car at market is totally different....you're a dealer with hundreds of sales, and a big existing inventory where your capital is invested. You don't need the experience, or credibility, you're beyond that. There's absolutely no reason for you to buy something where there's no profit in it. BP is simply providing a service, he's not investing any capital funds, nor has he logged any sales, the potential for him to attract clients and demand top $ for his services is solely hinged on his experience and reputation....and in these early phases, building concrete credibility through a couple successfully closed sales is invaluable imo. But again, if the potential client is dreaming - then you're not really building the experience you need, so pass.