Actually, Robert, if the bike is depreciated to zero, the rims on it when new were written off as included in the original cost, and if you haven't replaced the rims in the meantime, you can't count them again.
Pretty rough accounting of course, not the sort the IRS will let you get away with. But... What is striking is that your numbers match mine pretty closely, when one takes into account that you've done 45K in ten years and I've done 10K because, like Pavel, there were some years when for health reasons, though I strove mightily to be out as often as possible, I rode only a few hundred klicks.
Pavel, I think I pretty much match you for waste on Garmins with waste on BUMM lamps. And I burned out an electric motor and had to scrap the whole front hub system because I decided to go for a centre motor next. But that's all in the calculations, depreciated to zero.
Yo, Anto, of course you haven't got a clue. Ask your wife if you want a clue about arithmetic. I did, which is how come I have a clue. NO! On second thoughts, don't let her find out how much you spend on your bike(s).
***
Through all this my absolutely best added component purchases were, all equally valuable and receiving the full "recommended rating":
*Brooks B73 multi-rail, three helical spring leather saddle. (Thanks for the adaptor that lets me use it with micro-adjustable seat posts, Julian!)
*Chainglider to save on service, especially when I couldn't bend over the bike, and keeps my trousers clean.
*n'lock Swiss lockable stem, special handlebar with locking cable inside, and riser steering tube extender; saves my back, secures my bike against thieves.
*60mm Schwalbe Big Apple Liteskins tyres and T19A Extralight tubes for comfort
*8FUN hub and centre motors that let me keep cycling in very hilly country after heart surgery. I haven't had a car for a quarter-century and wasn't tempted to buy another one.
*Basil's Cardiff pannier basket (I have two but normally use only one), deep but open topped, for just chucking stuff in; impossible to imagine a utility bike without something like it.
*First series BUMM Cyo lamp, first adequate (barely but still) dynamo lamp for bicycles, lets me ride at speed at night.
*BUMM Line Plus, first adequate popularly priced adequate dynamo rear lamp. (Actually the BUMM D-Toplite of earlier vintage was adequate but it was ugly as sin.)
*SKS Renkompressor, a famous full-length racing mechanic's pump that saves my back.
*BBB's low-torque wrench kit that stops me overtorqueing delicate parts on my bike.