That's true... but.... with teams folding etc., many have to travel to see speedway. Giving Diamondboy and myself as examples... to get to say Redcar (our nearest track) it's (let's assume) £20 to get in + £3 Programme + approx £10 fuel to get there and back (cheaper if shared obviously, but still "extra" cost). It's not "cheap" anymore, especially in the current financial climate and the extra admission prices just puts more people off attending.
To answer your question regards admission prices at Newcastle in 2022 it was £18 for adults (and I'd guess it would be £20 in 2023 IF we had run).