I can be a variety of things:
- Money is too short to take it out on trips and maintain it but they owe more than it's worth so if they sell, they need to come up with money to pay the rest of the loan (ie: similar to houses that are underwater)
- Especially with the big expensive diesel pushers, it was probably thier dream to hit the open road some day, footloose and fancy free...then reality set in and they found they were scared to drive it or just didn't like the lifestyle but they had invested so much of thier emotion into it they can't bring themselves to sell because that would require them to admit thier dream has failed. It's especially bad for the expensive units because it's usually older folks who can afford them and they are prone to age related issues limiting them both in where they can travel to and how much maintenance they can do themselves.
- Too many toys: For most these are toys and people often don't consider toys from a financial perspective. I know working age couples with an RV, Boat, Timeshare and they like to entertain at thier home...there simply isn't enough vacation time to utilize all of them, so something is going to sit.
When the time comes to sell a toy, the best bet is to pull the bandaide. Expect to lose money but at least you aren't slowly bleeding it away with storage and rotting of the unit.