Dunno if it's a rule as such but a few years ago Paul Philips said there should be 40 finishers for a race to be a valid TT. It's a joke parade lap and everyone knows it. Every motor sport has rules but it looks like the zero win just goes to the team that can spend many millions with the rest literally miles behind. If they have to have the zero then so be it but don't let it encroach on the proper stuff.