The ability to make people laugh is a very rewarding thing as you immediatly know if you have made that all important link with the audience. However, unless you write your own material, a dedicated folk audience know all the songs, and there is nothing worse than dieing after you sing that hilarious obscure song you have just discovered, only to be told that Joe Blogg, floor singer, sings it (badly) almost every week (Remember Chastity Belt)
Oddly enough I resurected that song the other week and every one joined in with gusto as no one had heard it for over 30 years.

A good funny song can hide your shortcomings as a singer or guitarist (or both) but only for a short time.
I know I was that singer!!