I'm not sure that I understand your post, aabsolute.
It sounds as though you think the buyer submitting an offer isn't aware that the lender must approve the price, which is incorrect. Short sales are sold "As-Is" and require the Short Sale Addendum to the Sales Contract to which the buyer must agree to as part of the offer. The buyer is well aware of the short sale when it comes time to write an offer. Also, if a buyer is working with at least a half-smart Realtor, the Realtor has the ability to filter out short sale listings, foreclosures, REOs, etc., or include only short sales, foreclosures, REOs, etc. If you want to know more information about a property than you see on Realtor.com or whatever site you use, ask your Realtor to assist you. If you don't want to play this game with the lender, don't pursue short-sales. It is just that easy.
Regarding your last statement, no, the price is not the payoff in a short sale, if the market value is less. The property must appraise, and the seller would have a deficiency -- that is what a short sale is all about. You seem to be forgetting that if it won't appraise, it won't sell. If there is no deficiency, it is a normal sale.
So if Seller has a mortgage of 865,000 on a property worth about that, income to make payments and assets to cover a deficiency, is this a lender approvable short sale in your experience?