well for those that don't have the complete niche market then yeah, the labour costs are minimal. I do happen to be niche and even so I used to charge a tiny amount for labour. I set my prices on what the few others charge and as I've got better, so my hourly labour rate has increased. I'm not sure if I'll ever make enough from my niche sales to live off, but so far, I think it will be achievable when i can commit the time as long as i don't expect to ever go on holiday or buy new clothes