Not everyone who seeks his watch for profit is a dealer!!!
Some collectors have limited budget to which they trade up, sell their pieces for profit and buy others.
Even ones with big budget do sell their watches but not just because the lucrative profit that they see only because they are bored or grow out of love for particular watch/model.
I am a collector and will always be.
Though I sell some of my watches fir profit from time to time when I get bored with them.
Being a collector does not mean he can not sell watches for profit.