1. They get loving care for the first three years.
2. Then they get sold to some young thrasher who either destroys it in a single vehicle accident or they keep it for two years then sell it to an even younger and even more clueless thrasher.
3. Finally it ends up in the hands of someone who rides less than 1000 miles a year. This guy leaves it in the pounding rain all winter and is surprised to find the battery dead on the first sunny day in spring. He borrows a charger from his mother's boyfriend and manages to get the now damaged battery to hold just barely enough juice to start the bike once. After this first sunny day of spring the guy only rides the bike 3 more times that year. Since he doesn't want to spend cash on replacing the worthless battery he has to charge the battery each time he rides it. And now the charging system is starting to strain from constantly being at full output pumping electrons into a partially shorted battery. Motorcycle riding becomes too much of a pain in the butt and he leaves it parked for another winter in the rain. Next year the fuel has turned harder than epoxy and has completely plugged the pilot jets.
4. It won't start at all and is traded to a girlfriends brother for a case of Schmidt beer. The new owner buys a battery, but can only occasionally get it to start, and it dies at idle. He eventually decides that Jap bikes are cheap crap and buys a leather Harley Davidson baseball cap to wear to the tavern.
5. The bike gets pushed behind a dumpster at a crack motel and remains there until the motel owner pushes it out to the street where is sits on display like a dead possum until the county picks it up and puts it in impound. 6 months later it is sent to a metal recycler and smashed into 1000 Schlitz Malt Liquor cans. And up to this last point the crank bearings, cam lobes, piston rings, and all the other parts bathed in oil, still have 100,000 miles of usable life left on them.

Does anybody remember the Kawasaki ZX600 Ninja of 1985?
It was a cutting edge sport bike, then one of the greatest squid magnets of the late '80s and early '90s,

NOW THE LAST OF 'EM ARE PARKED BEHIND DUMPSTERS AT YER MOTHERS PLACE!

Oil doesn't kill motorcycles. People kill motorcycles.

This isn't 1953, it's actually kind of hard to find bad oil in 2004!

Just about any motor oil you get will be good and any Motorcycle oil you get will also be good and may also tolerate a longer interval between changes.

I wonder how many sportbikes with coffee colored brake fluid are sitting parked in the rain with $28 worth of oil in the crankcase.

Your bike is significantly more likely to be run over and crushed by a Pennzoil truck than throw a rod because you didn't buy Motul.