$150 for kissing? Good lord!
On the one hand, supply and demand: if that's what a girl charges, then fine; she just won't get many takers for it. At $50 she would get many more.
On the other hand: if Langtrees policy is that she should be offering kissing at $50, and that is known, then it's a slap in the face to turn around and demand more.
Bugger, now I've run out of hands, but anyway: if she has already charged for 'GFE', then like LongHair said: kissing should be included for no extra charge in GFE. I've never heard of a girlfriend who didn't kiss. My regular go to girl, Amy in Gilbertson Road, is hot as, and her GFE is inclusive of DFK (and much more). She does have one $150 extra, but that's for anal!