I can't say that I've noticed any across the board increase in the price of high grade British pipes. I would agree that Sasieni prices have increased, but Barlings have remained pretty stable, as have other makes. What I have noticed over the years is that the price that a pipe commands relates to the model, finish, condition, and presentation.
Since I'm more experienced with Barlings I'll speak to that. When it comes to Barlings, model and staining can have a dramatic effect on price. Given that condition is similar, a billiard or a Canadian with a lighter finish will generally go for a considerably higher price than a pot or a darker stained pipe. Very early Barlings, from the 1920's and earlier, often command a premium price if in excellent condition.
But pipes in worn condition, or in unpopular shapes, can be had for very little money. And the price can really be drastically affected by poor presentation. Some of my best values came from pipes which were poorly photographed, with dark or slightly fuzzy images.
The wild card seems to be increased demand from Eastern European and Asian buyers. Sometimes a nicely presented pipe will become the object of desire for several bidders with the result that duels take place that end up with stratospheric end prices which are not the norm. An EXEXEL Canadian Special grade can sell for $700 at one auction while another EXEXEL Canadian Special that is just as nice, can sell for hundreds less the following week.
A pipe that has been restored and well photographed will generally get more attention and a higher price than one that is dirty or poorly photographed. I think that such holds true across the board for eBay auctions.
The one area where I have seen several very high ending prices is with "unsmoked" pipes, especially if they still come with their original box and wrapping. A recent auction saw a 1950's vintage "L" size (which is a small pipe) go for over $700. Smoked, an "L" will usually go for $85 - $175, depending on the shape and condition. Five years ago I saw an unsmoked EL sized "Birdseye" stamped billiard (Birdseye is the rarest stamping there is in post war Barlings) in its original box go for considerably less, about $500. Is the recent sale price of that smaller "L" indicative of a trend or indicative of bidder stupidity? I'll let you know when I see a number of other "unsmoked" pipes sell at auction for higher prices. I bought an unsmoked EXEXEL 1940's pot several months ago for $140. It wasn't well photographed, but when it comes to Barlings I know what I'm looking at and snapped it up.
Barlings with the hemispherical sterling windcap, known as a "motor" windcap, typically go for between $900 and $1200 at auction. That price range hasn't changed in at least six years. The 1909 bent billiard motor capped pipe that I picked up about a year ago went for far less than half that amount. Of course, it was mislabeled by the seller, but plenty of sharks on eBay know where to look and the sniper came in at about $3 below my maximum bid.
Very nice Barlings can be found for less than $100 if you are patient and know what you are looking at. I just bought one for $85. Badly presented and I may find out that I bought a stinker, as it hasn't yet arrived, but to my eye it looked like it would clean up just fine. That's kind of the fun of the hunt.
And, a poker shaped Quaint went for less than half of its retail listing price of 4 years ago, yesterday.