If you lose your home team, the team you feel most passionate about, of course your love for the sport wanes, only to be expected.
Grading, I've always thought of this as making the track fair (not at Eastbourne and maybe Ipswich lol) and safe for the riders who I want to be able to give 100% every race, it's NEVER bothered me and it gives us time to talk about the race coming up, the race just gone, speedway in general or perhaps just life.
Sorry if you've lost your passion for the sport, so glad I haven't