What is your cost of maintenance

I bought a 1996 Class A GBM in 2004 with 24.000 miles on it. Had a lot of trouble with overheating, leaking exhaust manifolds, auto park problems, front end rebuild. I tracked all mods and maintenance costs which comes to $12,000 in 9 years and 70,000 miles of ownership. Roughly half the cost were mods, Headers,free flow muffler, CAI, HD front end springs etc and half normal maintenance oil and filter changes, 2 transmission & filter changes, 3 brake fluid changes, 2 rear end changes, 6 new tires etc. I included every thing that I had to buy nuts bolts,fluids, paint, FG repair, etc. Maintenance I did myself the front end, headers and muffler stuff I paid someone else to do. So if you divide $12,000 by 70,000 miles that comes out to 17 cents per mile or $1300/year. This is strictly repair and maintenance costs does not include insurance, gas or CG fees. I don't know if this is good or bad based on others experience. Hope this helps.