Actually, if that is the arrangement that the teachers accept, how can it be wrong? The teachers/instructors don't have to accept those conditions. Thankfully the teachers are wanting to share their knowledge with people eager to learn; some students might not be able to take classes otherwise.
If instructors only were in it for the money only, it would be sad. This arrangement seems to reflect their enthusiasm for what they do. Probably it does add to their ability to teach elsewhere. So it's still all good.
Yvonne
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