With Richemont as the owners, you can bet your house they will be.
When I was selling my blue Tudor Sub, I was offered £2500 by Watchfinder. This is a watch they're currently selling for £7500 on their website. Needless to say, I passed on the deal. I knew they'd low-ball me, but didn't think by that much!
Did you try anywhere else? Watchfinder gave me a low offer on a watch too, but still the best of the three I tried. Their trade in price was also the best I got. I think the conclusion is they suck, but other places suck even more!