I think he meant on washing and cleaning the Sheitls not selling them. Cleaning Sheitels is not 100% profit center.
I dont meant to be a killjoy here, but I dont want people to be in some fantasy lala land that you will make a decent income , Its hard to make a decent income required for a frum lifestyle and while a degree is no gurantee for success, it will likley help. A person with an MD usually makes more money than a Morah at a gan