I am not too sure if the fees are set in the same way in Scotland. Here the more people, the more you have to pay. The very top fees are set on capacity for the large outdoor events, so it is quite possible that the events referred to would suffer as a result.
Some of these outdoor fees are set at quite outageous levels, tens of thousands of pounds! Partly I would suggest to ensure that anyone thinking of staging such an event, will go elsewhwere.
This is not what the fees are supposed to be used for and it would be most unfortunate if the events referred to were to suffer as a result of this.