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Actually, every stamp collector takes price cues from every other stamp collector; what, after all, is a catalog?
A catalog is a reference work describing what stamps exist. Catalog
values are the least helpful information in them, unless you're hoping to buy a copy of a single stamp from a retail price list and want to know what to expect a dealer to charge. At auction, catalog values only enter into the equation in very limited cases. Don't believe that a stamp listed in the catalog at $5 is remotely worth $5, or even a fixed percentage of $5.
What is that stamp worth? Normally, it's worth somewhere around 4 cents, already mounted in a serviceable set of albums with about 30,000 others. We're talking about stamp auctions here after all, not the retail dealer
marketplace. You might pay a dealer $5 for it because it's the last stamp you need for your Elobey Annobon and Corisco collection, but that extortive price is just because you're paying for his mortgage. Most stamps, most of the time, are individually worth little to nothing. The way I value commons is: if they're new to me, they're worth a little, otherwise nothing. Fortunately there are still a lot that are new to me (when I first started working on my WW collection again, I set an arbitrary cut off end date, which was a mistake) so finding new common material is not yet difficult.
I buy large collections to build mine. The remainders are sold off, spread like manure, to newbies on
ebay, collecting friends of mine, or if they're good enough, they are consigned right back to the auction houses. If you're building a seriously big worldwide collection that's about the only way to do it.
And this might just be about the best time to build worldwide collections in ages, because collectors are retiring from the hobby in droves (usually, unfortunately, by death or old age) and there is far more supply than the market can really bear. I like to think that hopefully new collectors will sprout from the manure I spread, and it will help the hobby to survive. If it doesn't, well, at least we're having a gas now, right?
There are a few single stamps that I look for at auction, some from specialty areas and some I need for stubborn holes in my WW collection. I will pay real market value when I find them. In those cases market value will not be based on the catalog value -- it will based on the bids I and a few other similarly mentally ill people make for it. The catalog editors may even use the number we bid in the sale for next year's catalog, if it looks good enough. It takes a nice stamp to get me to throw money at a single stamp.
There is one other time catalog value means anything; that is when we're talking about one of the "expensive but common" stamps. These are the popular stamps: think dollar-value Columbians or Graf Zeppelins, or for that matter many early PRC issues; they are
everywhere (even small no name auctions usually have some) but still sell for significant percentages of catalog. Many of the Guyana surcharges from the 1980s are much scarcer (especially if, as I do, you prefer them postally used), but the pool of buyers is also much smaller, so by the laws of supply and demand in this case the rarer stamps bring less money than the common ones. There will always be "expensive but common" stamps, but as the demographics of the hobby change the particular set of stamps in that category will shift around as well. The best way to buy these IMO is to buy from uninformed sellers, which you might find (if you're lucky) on
ebay or Craigslist or the occasional local estate sale or even garage sale. Informational asymmetry is your friend: it's what can make the specialist get a good deal from a general collector or dealer.