What is average spent on 2001 or older motorhome maintenance

I have a 1996 GBM MH which I purchased 10 years ago. It was my first MH and not knowing much I spent a lot of money fixing things the first several years. Once the major things were fixed and I got help from folks on this forum and learned to fix some things the cost of repairs came down. I kept accurate records of what I spent which came to about $12,000 in 10 years or $1,200 per year. If I remove the improvements or mods like headers, mufflers, HD springs etc and just count oil changes, and other fluid changes(trans,rear end brake fluid) general maintenance it was about 1/2 of the total or $600 per year. I never knew if this was good or bad but I will watch this thread for other peoples experiences.