(sigh)

There are those who suggest that money/commerce/professionalism has no relevance in folk music, and never has. ('side' A)

And there are those who say that is not the case - that an element of commerce has been and remains a factor - but only a factor, while the unpaid element is crucial too. (Both 'sides' A+B)

No-one has suggested that money/commerce/professionalism is MORE important than the oral/amateur element (your other 'side' B) though people have been wrongly accused of doing so.

Your post supports the middle group very nicely.