Well, it doesn’t seem appropriate to me to bring the teaching of the ways to liberation into the field of business. As soon as one charges money for teaching a spiritual discipline, there are no more teacher and students but rather a salesman and a clientele. It is no longer teaching yoga or Tai-chi; rather, wisdom is sold like a merchandize. The (professional) teacher depends financially on the students (clients) in order to survive.
Making profit on spiritual teaching clearly affects the purity of the conveyed wisdom. I believe that any spiritual guide can be paid with a voluntary donation, or dakshina, but never commercialize it. Such ‘spiritual’ commercialization necessarily brings with it the business world together with its prices, competition, advertisement , etc. This is where the proliferation of teachers and new methods of yoga or Tai-chi come from, each promoting itself as ‘the best!’
I wouldn’t say that I’m against it, but it does make me uncomfortable. The thing is, when a path to liberation is brought to the commercial field, those who stand out are not exactly the best teachers but, obviously, the best businessmen.