Not sure what the obsession with BBFS is in some of these posts but having booked gals in the very high end market (and I mean approaching the 10K market) that was not something that was ever asked for or offered; fundamentally those gals - who you won't find posting or find review for - don't need to make such offers.
Very different than a dating relationship that comes out of this world which can also happen and where bbfs in theory might happen, especially when both gal and gent have on-going testing. In this vein if both are non-monogamous and agree that both can play that can work as well ... not everyone's cup of tea but it can work.
Caveat: porn stars are a whole different category, especially if one has a recent AIM test.
re: 1Janessa and better
Better is the wrong question. I have no doubt that some gals who are in the 300/hr range could accompany me to a black tie event, or play hostess at a business gathering. However, as a rule of thumb I would choose a lady who focuses on multi-hour, overnight, multi-day engagements if I required a date for such a role. So to name a few (some retired or mostly off the market): ladies like Lauren, Natalie, Lovely Victoria, Holly Brooks, Chelsey Heyden, Naiya, Jessica Taylor, Nina, London - since she has am HDH persona - would be far more likely options for that than ladies who focus on hour or 2 hour dates. It is really not an issue of better or worse but what a lady focuses on and the skill sets they most likely bring with them.
As far as expecting certain sexual acts when booking the high end dates, that was also never a case. I recall at least one gal that started out with CBJ until at least a 3rd or 4th date - and dates were always at least a dinner date.
re: YMMV - sure there are some things that a gal will choose to never offer (ie greek). However, I have found that at the higher end YMMV comes into play in many ways; while there may be certain lines a lady may not cross some lines are fungible and the more comfortable a lady is the more of those lines might be crossed.