"If you don't consider yourself as an entertainer then you have no business asking people to pay to come and see/hear you."

Or not pay, for that matter. Whether you are standing on a stage in front of a paying audience, or just singing or playing in the pub for whoever is there you should be aiming to entertain your audience. To do otherwise is just self-indulgence.

To imply that folk music is somehow too precious to be sullied with commerce demeans both the music and musicians. The idea that traditional musicians didn't sing or play for reward is nonsense - many of them were paid, in beer or in cash.