Because those that are getting excited, just love speedway. I don't think it's wrong that people are excited for a new season. I - personally - would still be getting excited if there were just two teams left as I always miss speedway over the winter.
Yes, the current situation is far from ideal and there's plenty that could be done in the future to improve things, but it's not going to stop me from going to meetings and enjoying myself. Boycotting the sport is not going to save it.