My bike is bone stock. The rider was modded 18 months ago. I had quintuple by pass surgery. I had been 185-187 lbs for several years, now I weigh 160-163.
I have had the following problems
Approx 14,000 miles I started getting a slow leak from the radiator. It was not enough to keep from riding so I waited for the 15,000 mile service as they would have it apart for the valve check. I think the new radiator was somewhere around $650. BTW, it was a leak in a seam on the left side.
Approx 21,000 miles the fork seals started leaking badly. I'm not a wheelie guy and don't do anything that should have caused that. I've never had a bike that needed the seals replaced. It was somewhere around $700 to have seals replaced.
28,000 miles fork seals leaking again. The short story is that the dealer agreed they should have replaced the bushings the first time, so they made me a very fair deal to replace seals and bushings.
Chain and sprockets replaced around 20,000 miles.
I was getting about 4,000 miles on the rear SuperCorsas. I think about 6,000 on fronts. I switched to Diablo Corsa Rossa III (I hope I got that in the right order). They are on the bike now with 6,500 miles on them and it looks like I'll get 8,000 on the rears and the front might last forever
BTW, I cannot tell any difference between these and the SCs.
Minor ..... I had to replace one of the rear turn signals. I'm sure the vibration got it. Simple and cheap. Right now the left mirror shakes badly. I think a broken spring. It still basically works, at some point I'll figure out a poor mans fix or replace it. I think I replaced brake pads around 18,000 miles. Did it myself. Rotors are still the originals. Zero pulsing.
Let me point out how I ride. I'm 67 years old, road raced as an amateur in the early '80s. I live in the worst part of the Houston suburbs for getting to good roads. About 50 miles to my first curve. No chicken strips after my first ride on new tires. I ride fast but not hard. Almost every time I ride I see well into triple digits.
Love the bike. Never expected to do what I do on it, or keep it this long. As you can see in my sig, I have three bikes. I retired the last day of 2018. In 2019 I put a combined 38,000 miles on my three bikes. About 6,500 on the 1199.
Service costs around $350 for service without valve check. About $850 I think with valve check/adjust. Since retiring I'm doing my own oil changes and other routine maintenance like brakes, chain etc.
Hope this helps.