Personally I think the lack of section 1 firearms is a big problem for the fair and would prevent me driving nearly 300 miles to go there.
Maybe a second event at Wetherby racecourse would be worth consideration?
BTW I used to take a table at the Bisley shows selling cast boolits but gave up die to the costs involved - I know Pukka Bundhooks also quit the shows for the same reason.