Airstream hold their value better than any other brand. Not cheap, but 10 years down the road, you will be able to sell it for the price you paid.
With most others, you’d be lucky to get 30-35%. An exception might be for very high-end coaches. You might get 50% back when you sell.
Many people like the idea of RVing, then the reality smacks them in the face. Once you buy, the other costs of ownership is not cheap.
I’ll live in my 1600 SF paid off modest townhouse and just drive or fly for vacations. For $5-7,000/year, I can go anywhere and stay pretty much where I want for a week 5-7 times. My younger son is an airline pilot and I don’t mind going standby, and airfares are really cheap if you plan ahead and use airline miles.
Well an RV basically has all the systems your house does, often with lower quality parts, and then gets a vibration test every time it goes down the road.