Duct Tape - although I think it may only be a requirement on the Dover edition.
Seriously though, I'd be looking at the following areas personally:
High performance bits. Sprockets, chains. shocks, aftermarket cams - that kind sof thing.
Regularly replaced bits, fairings, mirrors, indicators. That what reliably breaks when one falls off a bike.
Bling - hey, some people just want bling
Accessories. Paddock stands, generators (to run the tyre warmers) etc. Anyone racing will know this list of goodies better than I. What are the things people occasionally say "Shit - I forgot the xxxxx". It's the "xxxxx" you need to source.
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