I think people, FBO's included, think that if you can afford to own an airplane, then you can afford to pay what ever they want for gas.
I think this is true for about everything related to aviation from avionics to instruments, to the smallest of gadgets (light bulbs). If it has "air" or "av" in front of it, expect to take a screwin' on it.
Marshall Alexander
RV10
wings/tanks