I think the winds are changing somewhat, maybe even in the last 6 months.
Bearing in mind that the mod "industry" is still pretty much in it's infancy, we have recently seen The Scarab and Fortune mods, both priced competitively, and both British made. Admittedly they are made in short runs, but they are made in a country whose manufacturing industry is not renowned for being either plentiful or cheap. If they can make a mod in the expensive UK manufacturing market and sell it at a reasonable price, then people will slowly realise that mods made in other countries, with greater manufacturing capabilities and lower paid workforces, shouldn't be charging £150 for a mod.
Back on topic, the classifieds have been slow recently, not just here, but on every forum/facebook/etc that I frequent. Part of it is that we are in the holiday season and people don't have as much readily available cash. The other thing is that there is more availability. Over on another vaping forum, at the beginning of the year, 2nd hand Taifun GT's were regularly selling for around the £90/95 mark. 5 months later they are going for £50.
My big gripe is the used KFL market. People seem to think that £60 is a fair price for a 2nd hand atty, when they are only £66 brand new (plus postage). I just thing a reality check is needed.
I generally think that for high end stuff, I would aim to recover about 70% of purchase price, less P&P, but I am in a position where I am happy to hold on to stuff if I don't get what I want. If they don't want to pay it, then it is their loss.