Apart from the money, why would anyone want to do that?
More surprisingly, why would anyone buy such a piece of, well, photography? He started during a period where anything went if it was under the umbrella of art; I thought the world had woken up and moved on a little since then.
As for the "models" - well, I guess it takes the relative anonymity of a box of liquorice allsorts to make some worlds go round.
From the art lover perspective, one could always just open a large tin of small sardines. The thrill's the same, and you even get to eat the product.
;-)