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Well, I guess I will put my two cents worth in on this one. First of all, there is a big difference in QUALITY between the Parker Hale, Churchill, Sussex and other Factory or Gunsmith converted Lee Enfields. This also includes Gunsmith conversions, such as those done by Elwood Epps and others. Even on these rifles, the amount of work, stock wood, and finish will vary from the plain-Jane made for the Hardware Stores type of rifle with a minimum of conversion effort, to those Monte Carlo stocked rifles with some great pieces of wood on them, sights changed, blued, and polished up.
On the other hand, we have those rifles converted in "Bubba's Basement of Horrors", which range to fairly nicely done sporters that could rival the Factory ones, to those where the stock has been cut with a hacksaw, --------without taking the barreled action out of it, thus leaving a silver decorative saw cut on the bottom and sides of the barrel.
However, there is one Dealer here that gives an honest and conservative opinion of his offerings. I recently ordered a rifle that had a "rusty" description of the bore, but with a little work, the bore of this one turned out to be quite acceptable and shootable. Right now, it will shoot 1 1/2 inch groups at 100 yards with Factory ammunition and a good reload should better that.
Condition is also speculative, depending upon whether you are a Buyer or a Seller. I have seen "pretty good" bores as described, that look like a family of Gophers have taken up residence in, "slightly used" stocks that have large gouges out of the wood, and "good for the age" barrels where the blue has turned to a fine reddish brown. I have bought a few, based on the Seller's description that have turned out to be "disappointing", to say the least. I have also bought some where the Seller has given a full, honest and complete description of the rifle's condition, and I think you can surmise which Seller I will deal with again or recommend.
The Recreational Firearms Community is a relatively small one, and your reputation is everything on it. Word gets around fast. We have lots of great Members who are interested in collecting, restoring and shooting the Milsurp firearms. We also have a lot of them, and seemingly more each week, that use these Forums as a type of E-Bay for their goods, and are more interested in selling stuff than helping to contribute to the Hobby. You know the ones, --- they have 17 Posts, and 247 Trader Ratings. And usually these Posts are in the form of "What is this Gun worth?, and is followed a week later by the appearance of the rifle on the EE at the highest quoted price.
The Internet is also a contributing factor. A person can look up a certain rifle and find out what it brought at a Gun Auction, or is valued at other sources. The Auction prices tend to be crazy, as all you need is two idiots with a sack full of cash, and neither of them want the other person to get the item. They overbid, then try to add more to the item, and sell it online. These people generally have no clue as to the real value of the item, and while the Internet might give a value rangeing from $200 to $500, the higher prices quoted are generally for the scarce models or variations of the rifle. Take for example, a Wartime built Number 4 rifle, an early Long Branch Number 4 Mark 1 with the round cocking knob, a Long Branch Number 4 Mark 1*, and a later Irish Contract Number 4 Lee Enfield still wrapped in paper and Cosmoline. They all look basically the SAME, but when you look at the markings there is a big difference in value. However, the person who does not know this only looks at the prices on them, and which price is he more likely to ask -- higher or lower?
But the OP is right. It seems like the asking prices have skyrocketed in the last 6 months or so. Those $100 to $125 rifles seem to magically appreciated into the $200 range. I guess one way of measuring whether it sells for the higher prices is to see how many BTT (Back to the Top) posts are made before the Seller gets the idea that the firearm is overpriced.