Ian,
One of the guys I am friendly with in our local used to offer me money (as far as I remember, he went up to 50 quid at one point), for one and I was always of the mind that they had to be earned and couldn't be bought. Eventually, long after he had given up, I became less dogmatic, thought "What the hell?" and gave him one free gratis. My wife swears she saw tears in his eyes. He enjoys wearing it, especially when he meets his neighbour who is Glasgow's Director of Education. She looks at him, looks at the T-shirt, then back at him with an expression of consternation.?
I can't remember the last time I wore one of mine, so they're doing no-one any good. If you can help a good cause with yours then well done. Let me know how you get on.
SW