I don't think most men in this hobby are looking only for a massage. Some are, but this probably doesn't apply to the vast majority. If I wanted a conventional massage then I'd go see Amber at my chiropractor's office where I can bill the service to my health insurance as therapeutic treatment.
Never been interested in FBM without FS. I don't know why anyone would be offended, because I don't know of any case where someone is charging as much for a traditional massage as they are for a full service escort. At least, not for a provider who offers both.