This has been a thought provoking thread for me.
For all of us I think, considering the list's surprisingly heavy outporing of opinion. The other tactic that occurred to me was this: if this person is a DEALER, then surely he or she would have to OFFER the same terms to prospective customers that he/she is demanding for him/herself - i.e., if you buy a meteorite and the prevailing price goes down, you get your money back. Goose & gander.
Gregory