I think that you are missing one point here... Part of the service is to have a safe and comfortable/discrete environment for CDs. It means not servicing GGs.
It she doesn't charge for this difference, she could be out of business pretty quick. I agree on her charging more while bringing a more comfortable environment.
The only transformation service I've ever been was in Mexico, and it was a great experience. It's run by a marriage (he, of course, is a CD), and the wife is the makeover artist. They charge very little for the entire transformation service (about 50$), and it includes, using wigs, shoes, clothes or whatever you need from their site.
They run parties and keep a very healthy (I'd dare to say "family friendly") environment. They even have a CD friendly taxi driver, and have a locker service.
What I've found from some "specialized sites" the Internet is sometimes just ridiculous expensive. Shoes, regular clothes, forms, etc too overpriced, and they sometimes don't even post pictures of the real items. Don't get the point of buying in these places over the Internet
I guess that it just depends. It's up to everyone to decide to expend their money in whatever makes them feel comfortable.