I agree with Kip. Spaces should be counted because it is a keystroke. The company I work for charges per black character (no spaces - 65 characters = 1 line). I guess that's an angle that's needed in my area, as the doctors have a choke hold on their purses! However, I also think they use it as a "perk" so the doctor doesn't feel he/she is being nickled and dimed to death.
Just think. . .If you check around in your area and find out that the MTs/ICs charge for spaces and word gets out that you don't, you would probably end up with the majority of the business over time. But that's just my opinion. :p