In the context of this conversation it really doesn't matter how you define pro, or amateur, or full time or part time. The original 'problem' was that 'some turners' sell their stuff cheap and 'some other turners' find it difficult to deal with that.
So what we want to talk about ( and I don't know why I am saying 'we' because I have no interest in selling ) is how to stop, or cope with, people selling stuff at prices others don't like.
Round 2. ding ding.