Andy,
Just tossing in MTCW. A friend used to hang wallpaper for extra income (yeah, I know, much different-but principle the same). He was having a hard time cracking the "fancy" neighborhoods in town. A friend of his in the business full-time told him "Your price per roll to hang it is too low. Charge almost half as much more again." He didn't have the gumption to do that initially, so he went about 25% higher. The first job he quoted after that he got, but with this reservation from the homeowner. She said "Your price sounds low, but your references say you do good work, so I'll take a chance on you."
You can raise prices later, but it will probably involve selling to a different market and re-marketing yourself. As you stated, luthiers regularly raise pricing as work improves, so you can too!
HTH
Jerry