I think there should be a fixed arena in the middle of the country that has say 2 or 3 big events a year with a large audience to earn a little money to pay for repairs etc, and a small event every month or 2, just for robot with a small audence of friends and family.
The events should still tour around the country and offer a small discount of the big fixed event to advertise the event, then we get more friendly battles closer to home and with less of a cost for us.
as I am also a young roboteer who can only just aford a tiny £100 robot as I dont earn money and I ask for robot parts as birthday presents, I think it would be a great idea to have fixed arena to fight in, and we could provide our own tables and chairs and share tools so then we would have to buy less too.