c'mon Roy, 90% of big hp cars don't see the race track at all, 9% see it on the internet only. I guess 1% may visit a track once. 3 big hp GTRs in Aus regularly do track work.
so there is a market for this.
And you can be sure that billet fitting for the tank lid that seals properly costs a mint to produce. Looks excellent and much safer than the dodgy fittings most people use