Doug, I think that perhaps the TT 'brand' is not so strong.  Certainly it is with those of us that love the sport but like you say, we're a sub-culture within a minority, so to the rest of the World would it resonate at all?

And to Sam - I can't imagine the Ulster ever being part of this World Series.  For a start they'd have to pay a significant amount of cash to the DED for the priviledge of being under the TT brand and I doubt that a) they'd be able to raise the money and b) why would they want to?

The UGP has a great entry and good TV coverage already.  What benefit could they expect to receive?  I any case, the DED's plan is to form ties with countries who can be of economic benefit to the IOM - countries that may not be that aware of the Island.  Northern Ireland doesn't really fit that spec.