I think you've summed this up pretty well actually.
I've said for a long time British Speedway is marketed poorly and has for a long time used the 'family sport' banner, which I think is completely wrong. Speedway is just about the most extreme sport you can get, no brakes, 70mph and flat out on a dirt track with 4 riders spraying dirt everywhere. None of this nice family night out. As an extreme sport, Speedway could sell with the correct marketing drive behind it.