I keep detailed records on all my cars so I can tell you quite accurately!
My car hobby costs around $35,000 AUD per annum. The labour maintaining them is the biggest expense. I am involved in the automotive trade, and for every hour I work on my own cars, that is one hour I'm not working on a customer vehicle so I have to charge it out.
I spend about 200 hours per year on a fleet of 11 vehicles of which the labour rate is $100 per hour. The parts and consumables run at about $7,500 per annum and sadly, with the rise in classic car vehicle values over the last 5 years my insurance bill is now a painful $7,300 per year. Bring on the crash, please.
Over the past year, the W116 has swallowed the bulk of the money. I just checked the job card, I've spent 180 hours on it over the last 12 months, including the brakes, front bearings, exhaust, major service and that pesky starting issue. And it's still not done lol.
Whilst I keep such records, I have no issue with the money. I'm not a very wealthy person financially but I don't have children or a mortgage so I just call it the cost of doing business and forget about it.
There is a peripheral additional expense and that is the one of the factory. I could rent it out and sit back and collect money but instead it's full of cars!