Well obviously the engine is going to last longer if its run at 1krpm than if its run at 10krpm. But dont let that bother you. Your engine will last 100k miles without too much trouble. Or maybe much more.
Lets face it, most sportbikes die a violent death rather than of natural couses. So if you cant get out of someones way becouse you are in to high of a gear, than your bike isnt going to last nearly as long, get what I'm saying?
As for sounding like a racing maniac, dont worry about it. Most people already view you as a racing maniac just couse you got a crotch rocket. F'em, they're just jelous.