In my experience, there are at least as many "nice guys" successful in biz as there are pig dogs. When I deal with these nice guys I do the best I can because I know I will be treated properly in return.
Even in a private sale I would only allow early access to allow for quoting, and then ONLY if it was a normal 4 to 6 wks settlement. Had a buyer negotiated an extended settlement it would be strictly "money first".