Dick, at the start of this thread you said, by way of explanation:

"I am suggesting,that on top of my fee,a person should feel free to tip,if they have enjoyed themselves."

I doubt many would disagree with that, but isn't that already the case in the UK? No-one is actually discouraged from giving tips to performers, they just don't usually do it. Most of the reasons for that have already been clarified. As I see it, no-one is disagreeing with you, but at the same time a system where tipping becomes the normal custom is justifiably unpopular with both organisers and audience, and not in their best interests or, ultimately, the performers' themselves, consequently the 'folk scene' in general. Also, English folk clubs have precious little in common with Irish pubs - different kettle of fish altogether.