"Or, for that matter, £5k per IVF because a 39 year old suddenly decides she ‘needs’ a baby, despite never trying before"
I fail to see how that is equivalent in any way to buying a woman's vagina, or arse, or mouth solely for your pleasure.
Equally, if you are selling a package holiday where you know hotel workers are kept in a compound and worked 70-80 hours a week to service the needs of your client, is that so much better than pimping?
One wrong doesn't justify another one. You're effectively saying 'look people are really exploited there, so it's ok to exploit people here'
And again, sorry but they are not equivalent situations either.