Sure they're rare. So?
As an example that I use a lot... I own a 1960 Lincoln Premiere coupe. Perhaps as many as 15 are still running and no more than 30-40 still exist in any condition. 1,364 were made. Mine is one of perhaps 100-150 of ANY 1960 Lincolns fitted with factory cruise control. In similar condition I also own a 1957 Chevy Bel Air 2 door Hardtop. Thousands and thousands of the something like 80K produced survive. It's not a rare car at all. The Chevy? It's worth triple what the Lincoln is worth.
Like ANY other collectible rarity is only one part of the equation. Demand has to enter the equation. My super rare Lincoln is worth about as much as a 3 year old Hyundai Sonata because nobody collects them. On the other hand look how many people want a 57 Chevy. Even though it's common, they're expensive.
There's lots of stamps that are very rare and worth very little. If no market exists for them then they won't be valuable.
If you want to get into flyspeck philately then I'd suggest getting into Australian Roos and KGV heads, those guys go nuts for very minor plate varieties. Heck, in the stamp I collect there is a Scott listed plate scratch (Scratch under A of Postage), know how much of a premium they bring? Minimal.
Go to Siegel Auctions, look up sale # 995 and look up lot #2014. And this was a sale where stuff blew way past high estimate time and time again, often bringing multiples of high estimate. I was there, so was chipg. Why did those plate scratch 12c 1861s bring just over HALF of LOW estimate? No collector interest.
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ebay, would that change if I listed my Lincoln for $750,000?