Agreed, Vivacia. I think there would be real interest in a documentary investigating how and when this 'tradition' emerged. And where, too. I was at school with quite a few Travellers growing up in Ireland, and their lives were absolutely nothing like the ones portrayed in these TV series.
I suppose part of the problem in that kind of investigation is that Travellers don't keep a lot of written records, so it's difficult to look at even the fairly recent Traveller past, because theres so little recorded. But it would be possible to talk to older Travellers, surely?