How many businesses have operated? Many! I myself have not. Most of the guys selling the CD ignitions do RC flying and work on engines ect. They do not do the selling part to make a living. IT IS PART OF A HOBBY TO THEM. They sell this stuff to friends and whoever and at the same time have plenty of goodies for the enjoyment of their hobby. I predict there will be many .51, .60, .75, .90, .1.20 2 cycle engines that will be run on gas with CD ignition. Also the 4 cycle engines are starting to appear from Saito and other brands. CD ignitions will become kinda standard in time as a option on new RC engines. Bottom lines...ignitions will and should become very inexpensive. So there you have it , get one and enjoy it before you croak! Capt,n