Well, there's one that I've experienced that even says shes a GFE, but really isn't, yet she's a 9.5 in the looks and should have been cast as Wonder Woman for her physique, stature, face, butt, chest, and hair. Her oral skills are top notch, but during sex, she moves like its a medical procedure...very clinical...distant. But everything is top notch, as is her hygiene and incall choices, and she's very reliable and easy to get along with and schedule, and her rates are fair. So yes, the hotness factor (and familiarity) often have won the day for her.
That said, I'd love to try Kat, the alt/goth chick with the bat-tattoos from West Mifflin because that kind of crazy is probably awesome...but crazy can often bleed into unreliability, uncomfortable issues, scheduling problems, etc. So I probably never will.
So, in short SexyMaid, I think hobbyists juggle an internal mental weigh-station that evaluates hotness, affordability, reliability, provider performance, and comfortability.