If there were a formal auction for it, it would be sold to the highest bidder. I don't see anything wrong with that.
Seems to me similar to other rarities, like chalk white blue eyed gators, or lion/tiger hybrids. Two heads happen by accident, fortunately, they can't be bred for, so the trait won't be perpetuated. I'm much more bothered by people who purposefully breed detrimental traits into animals - like extreme short muzzles in Boxers, for example. However, that said, as a goldfish fancier, most of the fish I buy are fish with detrimental deformities, so logically my own stance is hypocritical.