a) £2m is a life-changing amount and having it at 19 means that by 40 this woman, her family and children could be in a position that they will have no financial worries for a couple of generations at least.
b) The price is that she has a shite time (which is probable but by no means guaranteed) when first she has sex, an event so distant and unimportant that many, many people can't even remember when and where it happened.
(Incidentally, you cannot simultaneously argue that virginity is unimportant as it commoditises women and insist that this event is going to be of special significance because it is her first penetrative shag. For the record, my view is that virginity is irrelevant - it is a means to control, criticise and harass and cause guilt in women that deserves no traction.)
c) There is a risk of sexual assault. I am not convinced that that is greater than would occur had the chap bought her some wkds and a portion of chips. I notice that the woman will be chaperoned by a security guard. As part of the negotiations it would be open to her to dictate terms that would actually make it rather safer than were she to sleep with any man.
d) We are not going to advance the perception of women by depriving this woman of her freedom to revolutionise her life. Change will happen because of persistence in our ordinary lives. Daily advertising is immeasurably more damaging than a very occasional headline like this.
e) I don't follow the argument that if she does this, the price would come down. If the price comes down, the seller will decide not to sell. Problem solved. The argument only works if (bizarrely) the person advances it actually supports a market of this sort!!
f) The 'purchaser' is in all probability a man with revolting views of women. He does however have a great deal of money so like Trump and Roy Moore, he will be able to exploit women with impunity for many years to come. Stopping this transaction will achieve nothing. Insofar as it does anything, it allows some of his filthy money to be put to a better purpose than was likely in his hands.
g) I hope she is alright afterwards. But she will be far from unique if she regrets her first shag later. I guess that most of us do in some way. It does not stop us being happy and fulfilled adults later.
h) Leave her alone.