Everybody has their pricepoint but I will say this....
I have seen some awesomely beautiful rmp gals, virtually all are very lax about how far you go(short of fs),,,and if you get the right one IMO, the experience is just as good as fs. My experience with rmp's is that I am much much much more satisfied than not, which is the opposite with fs amps.
And CERTAINLY, a non-fs rmp is WAYYY better than a non-fs amp. As for comparing non-fs rmps to fs amps, it depends on what you consider value. One overwhelming advantage to an rmp is that you have a great variety and all pretty(except for the mature ones), while amp girls are all Rainbow-esque and quite boring.
cantinflas,,,I pm'd you.