There's no way TF would spend that kind of dough on a poster, but he sure as Hell will try to get that much for one, and more if he can. TF likes to pay pennies for material, then sell it for dollars, as in a 1 with two zeros in back of it.
Todd was the owner of the Mummy poster when it sold at Sotheby's for the $450K. The buyer at the time is not what most would call an active collector, and there were constant rumors of a back-room deal for Todd to purchase it back. His access to the piece in the ensuing 20 years has done nothing to quash those rumors.
Todd does pay up for material from time to time - when the first set of Son of Kong 1-sheet and 3-sheets surfaced at auction in 2005 (Hollywood Poster Auction), Todd paid over $58,000 for the 3-sheet. When the B Style Dracula sold for $77,000 at auction in 1993 (an auction record at the time), Todd told me then he had paid $90K privately for the Mummy poster and I have no reason to disbelieve him. I believe he purchased the Bride advance from Harry Thomas and paid a record at that time, of course back then the record was still a four-figure price. But it still takes guts to set a record no matter the year.