Having just left the buyer's market 9 months ago, I can say that I've seen quite a range of prices on these boats. Low 15-20k all of the way up to 70-80k. At least from my shopping experience, condition does play a major role in the price of Morgans.
I did not find that in boats from other builders. I looked at A LOT of boats and asking prices were ridiculously inflated relative to comparable Morgans in terms of size, condition, age, equipment, etc. Frankly, I saw a ton of pigs commanding, in my view, unrealistic prices. Perhaps the general boat buying public is shopping strictly on name alone. Stick the name "Tartan" on a boat, and sellers expect to sell it for a king's ransom - regardless of the hole in the side of the hull (true story).
The difference was so glaring that I felt like I won the lottery when I found my boat. I still feel that way after having owned her for about a year. Granted, she isn't perfect and I had a motivated seller, but my boat is in awesome condition.
If anyone cares, or if it helps them value their own boat, I paid $34,000 for my 1981 Morgan 382, hull #257 in March 2013.