i don't think i would object to the category per se -- i could be persuaded to donate my body to such an exhibit especially if they told me they gave me a consent form that was like "here are the possibilities, check the ones that tickle you".
People say that even without a payment to the donor's estate, because donating offsets the cost of disposal that would otherwise accrue to the estate.
Personally, I would consider donating my body to an exhibit in consideration of being exhibited; although I'm not much of an exhibitionist, so I'd still have to think about it. Similarly, I think I'd like to be respectfully dumped in a body farm, so forensic scientists can get more data about bodies that are less respectfully dumped in various places; that's an experience my body wouldn't be able to have except through donation or murder, and I'd rather not be murdered.
Well, they would say it if they wouldn't pay them enough.
There are bigger problems than that, though, with bigger incentives to kill someone (in addition to those that the people involved with the exhibition have).
So, if they really think that exhibition has educational value (and enough of that to justify it), they should operate as a non-profit, with no revenue out of it, and with at most modest compensations to everyone involved.
