Lots of frames go for more than they are worth and lots go for the opposite as they are not the ‘in’ brands.
eg Inbreds have always held their value very well – it’s a cheap frame that not so long ago was £134 yet you see them fetching £100+ on ebay and £80-100 on here. I guess On Ones poor supply and cheap initial price help keep the depreciation to a minimum.
Yet another British brand – Merlin who have very good kinesis made aluminium frames don’t get the recognition. I have had an inbred and now have a C456, a 29er scandal and a Merlin Malt 2 and I have to say the Merlin is the nicest finished of all of them all, both in construction and that it is powder coated from new. It is also the same geometry as the Rock Lobster frames which have a good reputation as being nicely handling frames.