...I had some more thoughts on your question - unfortunately I know I am still not directly answering it Goldie!
But, I think more important than setting importance alone, it is important to always consider at what price. I might tell you BBBJ is a 10. But, if you tell me it will be an extra $200, I will probably tell you just HJ is just fine!
I think the base case FBSM is 1 hr: good-looking topless girl, mediocre massage, some small talk, and HJ to orgasm for $150. It doesn't matter whether there is massage table, but it should be clean environment with very good hygiene standards where I feel safe and comfortable. Refreshments are not expected and I would not pay extra for them.
Looks: For hot girl I would pay an extra $50. For Victoria Secret Model type I would pay an extra $100-$150.
Unique Skills: If you bring unique skills (usually clear from reviews), I am willing to pay more. Specifically, if you really know how to tease, please, and make-love to a cock with your hands I would pay upwards of an extra $100. (google Klixen hand job or Hegre-art tantric milk for examples)
Mutual Touch: this includes kissing, touching your body, body-slides and DATY. When I opt for FBSM, this is not a big deal for me, as part of the appeal is to simply enjoy a one-way street. Maybe an extra $100 if in the mood... This obviously incorporates fully nude massage.
Location: I won't pay extra, but I personally need incall. In addition, if your location is not convenient, there is no $ amount that makes it work. As an example, I would never see someone in Carlsbad/Oceanside - it is just too far for me. Similarly, I have had regulars where a big part of what makes it work is they are only 10-15 mins away and super easy to get hold of and make last-minute plans.
Prostate Massage - I have tried it but certainly not a regular thing for me, and this would never stop me from seeing someone if not on the menu. Maybe an extra $50?
I also think there is an opportunity to provide some other services along the sensual/erotic spectrum that could fit in nicely with either FBSM or FS:
* Role play - teacher/student, doctor/patient, boss/worker or servant
* Fantasies - threesomes, voyeur, etc.
* Sexual Education - teaching guys how to be better lovers. There are a lot of videos and books out there, but to actually be able to learn while experiencing would be amazing.
* focusing on the most important sexual organ - the brain. Very few really excel at knowing the art of seduction, desire, and creating that intimate connection that takes a sensual/erotic experience to another level. This could also includes things like Dirty talk, etc.
I could easily see paying an extra $100+ if one of these layered on the regular FBSM