Batting .667
While some of what was written above is quite true, my experience is:
1. Older lady, as described above, but really "knows" what she is doing.
2. Much younger, and cuter girl, to the point of being shy. But, very skilled at the art of teasing. Intitally I also was asked for $80 tip, but when it appeared she would get no tip, suddenly the request was cut in half.
3. Average looking, low 30's, who knows what the market price is, and delivers the service for the proper price, and with great skill, I might add.
Moral of the story is: YMMV, and timing is everything.