At least for the first ten years, depreciation (and cost of money) will be the single largest part of cost of ownership. The older the motorhome, the less the depreciation, and it continues to be less year by year.
The less you pay for it, the lower the cost of the money tied up in it (interest on loans, lost income on investment). Usually lower cost for casualty insurance, lower taxes if you are paying value-based taxes.
On the other side, the older it is, the closer it gets to an age where parts availability might be a problem, and to needing major maintenance, e.g. replacement of furnishings like refrigerators that have a finite service life.
Over an even longer term, an RV can reach an age where depreciation has essentially flattened out, and one might sell for what one paid to buy, even after another 8-10 years.
