It seems auction prices are quite healthy;

https://auctions.asm-autos.co.uk/vehicle-list/details/1994-morgan-4-4/453975

Now up at £18,500...

It seems there are some over priced cars for sale from non Morgan dealers.. I would prices are quite static over the last 3 years or so.. About £13 to £15k entry level for a sound car. Yes you can spot them at £10k but I bet they don't last long unless they need a rebuild.