I think another factor here is amount of expected use per year, for people with 2 weeks of vacation time per year cost of ownership (insurance, storage, etc.) will be a much higher burden, than for retirees, snow birds, and full timers. Personally I am somewhere in the middle of that specturm, semi-retired, but my wife still works full time, but gets a good many vacation days per year (over 30 days per year, and growing by a bit over 1 day per year). In my first year of motorhome ownership I have spent about 50 nights in my motorhome, about 1/3 solo, about 1/3 with my wife, and about 1/3 on weekend trips with my college age son.
In my first year of ownership of a 15+ year old coach, I have spent something over $6,000 on maintenance and upgrades, plus about $1,200 on insurance, and road side assistance plans, and group memberships (good sams, america the beautiful pass, FMCA), thankfully I have free storage in a shed on the family farm about 15 miles from my house. Of the $6,000+ I would categorize only about $1,800 as absolutely necessary (brake repair, dash air conditioner repair, fluid change, new spark plug wires, marker lights ...) The rest I would consider optional upgrades of varying levels of importance, TPMS system, new shocks, sumo-springs, SeeLevel 709 Tank Monitor, LED headlights, spare tire and hitch carrier... I am hopeful that year 2 will be cheaper, as I now have most of the major upgrades I want to do done, though I will likely need new house batteries before long, and new tires in 2 or 3 years, so there is always some ongoing expense. As to daily expense on the road, it will of course vary, but so far I am averaging somewhere between $25 - $30 per night, with $10 (well $0 for a few nights in truck stops, or on private land) being the lower end and $125 per night being the highest, but that was for the big solar eclipse, otherwise $55 is about the most I have spent for a single night in tourist areas.