But what is the bar for 'exploitation'?
In order for it to be completely exploitation free, no money would change hands whatsoever. Because as soon as money comes into it, you are always going to have some women who will have a lot more 'need' to do it than others.
Otherwise, for example, Oli Locke wouldn't have to be combing the globe for a surrogate he can pay, because one of his wealthy female mates would do it out of the goodness of their hearts for free, wouldn't they? Same for Tom Daly, Lance Bass, Mark Fehilly and Kim Kardashian. They must all have friends or family who would love to give them the 'gift' of a child? So why do they need to pay strangers?