Next time a dealer gives you that "Rolex hold their value" line, ask them for a written guarantee that they will pay you the same amount as you purchased the watch for, whenever you feel like selling it. They will not put their money where their mouth is, will they?
He ( https://www.youtube.com/watch?v=sWwQZ3VM32I ) wanted a "fair trade" from a dealer to "change" his Rolex. Guess what happened. One dealer would not touch his used Rolex with a 10 foot pole and another one offered half of what he payed 8 months ago. So much for holding it's value...