For me there is way more time invested in the shafts by the time they are ready to be made into arrows than anyone would ever want to pay for. I never timed it actually but three or four hours per dozen is about what it takes me (guessing) to straighten a dozen shafts. Then they have to be sanded too. I'd have to get at least ten bucks a shaft just to turn a profit, then after about two days I would be so tired of cane shafts that the price would go to twenty bucks a shaft just so people wouldn't buy them and I wouldn't have to staighten anymore.
A dozen freshly straightened cane shafts is a beautiful thing to look at though. I just love it once they are straight and sanded ready to become arrows.