Somehow I missed this thread. Let's see Suit, this is what I do for, what I like to call "running costs"... Keep in mind, this is my own scale, and has nothing to do with the recommended maintenance of the owner's manual. These numbers I've picked from speaking to a lot of racers (cause I don't ride my bike easy, and I'm looking to reach 100K before the engine blows up.

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1.) Oil changes, every 1,500 @ $14/change (includes filter) - 10-12 of those a year. ($140-$168)
2.) Brake pads (Front every 6,000 miles, rear every 14,000 miles), $30/pair (3 sets total a year) ($90)
3.) Tires (Rear every 8,000 miles, Front every 12,000 miles), $200/pair ($300 - 1.5 Rear, and 1 Front)
4.) Complete fluids flush (radiator and brake), every 15,000 miles. $15 ($30 for fluids which lasts me 2 years).
5.) Valve adjustment (I do my own, so my only cost is the shims, and the more you buy, the less you have to buy, cause you can re-use them over and over). $6/year.
6.) Sprockets and Chain - Supposed to last over 30K, but I get lazy or busy and don't adjust/lubricate as much as I should, so the last chain (the stock one), lasted me 18K's. ($75/year - sprockets and chain = $150, but I should ride 2 years on a chain).
7.) The biggest cost, FUEL. 12,000 miles/ 55mpg (what can I say, I can't keep my right wrist under control) x $2.90 (estimated yearly average) = $632/year.
8.) Insurance: For me, with 3 bikes and 3 riders on my policy I end up paying $398/year for my ninja - policy is more, but that's for other riders and vehicles...
9.) Gear: I tend to spend about $300/year on new/better gear. Initial investment was off the charts, but I can't remember now.
So, let's add it all up: $1984 in total/year. That's too bad, I'm going to have to spend 1 more $ to make it 1985, the year I was born!
Hope this answers some questions, although very, very late...