My 2002 Ford is increasing in value. 
I have owned my 2004 Jetcraft since 2008 and it has gone up in value about $3,500.  Yamaha 115 is very dependable and I do my own maintenance. Same with 8hp Honda kicker. 
All are paid for. Boat is stored in the yard. It is appreciating faster than the cost of ownership. 
My 2013 Rockwood is a recent acquisition, but I have cleaned it up and added solar.  It is worth a little more than I paid for it. 
Buy smart and take care of your stuff. I pay cash with $100 bills. 
The cost of ownership is nil.