Tim... stop being so modest. You and your lady wife make some darned fine noises and have had many of us entertained. I would be happy to buy your CD (if you make one) You are a good songwriter and performer.... so please stop putting yourself down.
In the days when Folk music was a man thing mainly after he had worked the fields and the harvest was done .... copious amounts of ale were partaken of and ALL present were expected to sing... even those who were tone deaf... it was the done thing. (It did also happen at sea of course but more controlled)
I agree that 'anyone' should be encouraged at singarounds no matter how good or bad.... but only given paid work if up to scratch... almost word and note perfect.
I do note that there are those who believe that if you can't sing you should shut up!!! I guess they are those who consider themselves better than the average..... best of luck to you.. if you want an exclusive club.. start one of your own.
Best wishes, Mike.