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Not automatically true. It very much depends on the type of stamp. It might simply be a more popular stamp.
Or there may be insufficient field data for the Scott editors to update the listings. I encounter this all the time with revenue bisects and double impressions (and plate varieties). Some of the prices have not been adjusted in decades... literally.
One of the problems is low populations, so the pieces come to market very rarely.
Another is pricing tiers. Stamps that catalog in the many hundreds or thousands of dollars usually are lotted as single stamps, which makes obtaining pricing data easy, whereas stamps that catalog in the $50-250 range usually are not; they are lotted in groups, which makes extrapolating values of specific stamps virtually impossible. So, since data is never passed on to Scott editors, the stamps never make it out of that $50-250 "tier" into a value range where lotting as singles is more likely.
The stamp effectively needs to "gain momentum", i.e., get past the point of group lotting, to the point where it can be identified on its own, at which point it may gain traction and acceleration as far as catalog value increases.
Also, as Bart says, there are popular stamps and there are rare stamps, and the latter does not necessarily translate into high value. You can't go to a single stamp show or auction without seeing MULTIPLE sets of zeps, Columbians, U.S. #1, #2. None of those are rare (or even scarce). They just are in high demand. Conversely, I have items in my collection with populations in the single digits but only catalog $100-300. The collector base is very narrow, so demand doesn't drive catalog value up.
Catalog pricing is a fickle thing, and does not necessarily reflect actual value. There are certain items on my want list that, when I do find them, are priced at multiples of Scott. Upon inquiry, the sellers just laugh at Scott as being completely out of touch. Normally I would just ascribe that reaction to normal dealer B.S., but for some items it's absolutely true...