Mousethief, I'd say that the erudite folkies are more likely to carefully listen to a changed version of an old song, and then buttonhole you later and sing you 3 or 4 variants of that song. Whether you want them to or not.
I doesn't seem to happen on Wolfgang's scene, but the British tradition is largely recorded by collectors, from oral sources, and then bowdlerised to remove the naughty bits, and consequently there are few 'original' traditional songs, just several folk-processed variants.

On second thoughts, I suppose it depends on your local pedants, really.
Bowdler was an English vicar and song collector. So was Spooner a vicar. What these clerics will do to be remembered.....