LOL- bikes are my real biz to this day. I have 14 of them right now, going to have a dual sport rental biz soon as well, as well as renting "chase" jeeps.
7 second bike is wicked fast!
I build cafe racers, street fighter, choppers, anyone that I think can sell- all japanese based usually, though I do throw in a Ducati or Triumph here and there LOL. Z1s are my specialty bikes. I have 5 of those. My V65 Sabre I have had since 1989 and my Z1 900 B I have had since 1982! My V65 has 200+k miles on it now, and I broke into the 10s with it in 1990, the only year I drag raced it.
Bikes are way easier to launch on the street than a car, and way harder at the track! Since you can run 9s on a 'Busa in bone stock form with a good rider, that rider should be able to take pretty much any street car, anywhere. Getting a 8 second strip car is pretty much impossible to launch on the street, so bike wins every time.
I used to take my Z1 Drag bike, wheelie bars upside down and the slick and tools mounted between it, to the track, run 10s, drive home. 40mpg on the street. Hard to be bikes LOL