not sure what you mean by a business that doesn't sell any services. if you work or do any business or even volunteer you are supposed to have a work permit. but dont worry too much (in thailand there is always a way)
it's quite a good deal (if you dont mind paying up front rather than incurring the costs over time) to save all the hassle. but remember its not a work permit and you need a work permit to work.
strictly speaking, it would be illegal unless working through some sort of company / subsidiary in thailand (with a work permit). however, nobody will know your plans unless you broadcast them via the world's biggest social network.
