Let's say you have a domain which you're doing outbound for and 2 (or more) people showed interest and were willing to buy that domain. After a couple email exchanges negotiating the deal, you decide to create an auction for that specific domain with a minimum bid which is of course their offer on let's say Sedo. You invite all parties interested in this domain name to battle their opponents and who bids higher gets the domain for themselves. Question is this ethical or would this just make them bail?