Agree on the Rockwall comment. Seems like most folks in Rockwall do not want to leave the Island and no providers provide on the Island (other than outcalls).
I actually am close to the area. I've had some luck, but most of the guys in that general location have tried to get me to lower my rates and try to low ball based on what 'other ladies' charge them.
So it's much easier to go North or Central but I like to move around so it's not a crippling factor.