The problem with being cheap is that you have educated them to expect a lot of work for very little money with very great flexibility. Transitioning from being cheap to well recompensed is going to be very difficult if not impossible. If their sole experience of getting website work done is you doing the work for very little, being very responsive and doing far too much work for the hours paid then that's what they'll expect. Of course, they'll refuse to pay you a decent amount of money but when the salesman from the web design company comes along with the flash suite and winning smile they'll pay whatever he wants and be grateful for it. Don't expect any wistful goodbyes or expressions of regret over the great service you've provided because they'll respect the web design company more than you even though they'll deliver a crap service and eye watering prices. So it goes.