Depends who you want to teach really. The way you set it up determines who will come.
People should be paid depending upon how others value what they do. Making a business of MA is inviting lowered standards, low quality students, and so on. Depends what is most important to you, how you choose to do it.
I can't speak for other arts, but the overwhelming majority of the best BJJ instructors in the world teach as a commercial business. Likewise the overwhelming majority of the best BJJ practitioners in the world train at academies which are run as commercial businesses. I consider that empirical evidence that running a martial arts school as a business does not have to lead to low standards or low quality students.