Speaking as an event organiser (Scottish Smallholder and Grower Festival, 27th September, Lanark Agricultural Centre), I sympathise but I can see it form the other side. The costs of organising an event is huge.
Unless you get really good entries in livestock classes, the cost of prize money will exceed what comes in as entry money - plus the cost of rosettes, prize cards, engraving etc. A decent trophy will cost £70 - 100 to buy.
We use the market but we have to pay a pretty substantial hire charge, plus pen hire, advertising (massive costs), insurance, hospitality, expenses for judges, speakers and demonstrators and so on.
We charge £10 for and adult and under 16s are free; car parking is free; £40 for a craft stand and a bit more for trade stands. We think it's good value but we get folk complaining about the price every year.
Entry fees are £10 for first animal and £5 thereafter; £2 per bird in the poultry show and £1 for the Garden, Craft and Food competition.
I fear many shows are running on a shoestring and may fail, which will be sad.