To me, the words "taking advantage" evoke thoughts of a NEED, like food, water, or shelter, being grossly overpriced. The lady is running a small business in a niche market. Her time will be pricey. That's just basic economics. And I understand that for some "baby time" might feel like a need, but in reality you won't die without it. The honest truth is, that there aren't that many women into this kink, and those that are would rather play the baby role (gross generalization based on female ab's with whom I've had contact). Supply and demand my friend.
If it makes you feel any better, a good pro-domme in a major US city will charge you about the same. It isn't just AB's who drop the big bucks.
Daddy's Ballerina "e"