Some interesting thoughts there WE, and it is good to see a trader taking part in discusion here on the board.
I would not say that collecting a designer watch is most inportant but that may well depend on your view or what a designer watch is, I think that most people go for Iconic brand names as opposed to a designer (Gerald Genta being an exeption with the Ingy, Patek Nautilus and the AP)
One of the most colected watches, the Vintage sub was still made in vast numbers and has an unrivalaled popularity and value today for those people with Gens these are as good as money in the bank.