I'm a firm believer that if you bought it for a fair market price (whether that's 6 months or 6 years ago, Rolex or not) then feel free to sell it for whatever the fair market price is now. Bargains should be passed on at bargain prices. Unfortunately it's got to the point now where next time I pass on a forum bargain I'll be leaving it 24 hours before I pick a trustworthy buyer rather than it going to "fastest finger first".