I don't think much of the "Fantasy Suite" concept, either.
It's a "no-win" sitution for women.
If they refuse to spend the night wth the Bachelor, they will always wonder if that's the reason they were rejected (ie. didn't get a rose).
Alternatively, if they spend the night with the bachelor and still don't get a rose can you imagine what that would do to any womans' self-esteem?
I think that it's a "no-win" situation for women.
To answer your question, I suppose it's not some form of pimping because the women are not being paid for their services. Nor are they handing over any money to a third party outside of the relationship. That is a legalistic difference.
There is clearly gendered inequlity here. The WOMEN WAIT to be selected, by HIM, for whatever activity HE selects, when HE (in connection with production staff) decides to do it.
On an emotional/psychological level, I am sure some women leave the show deeply troubled at the outcome no matter how early (or late) they are rejected. That HAS to be DAMAGING to them, in psychological terms.