I have nearly a thousand of them that have gone into tubes over the years. Perhaps - and a BIG perhaps - if any sort of market ever picks up for these and I get caught up on everything else I'm working on (which may never happen), I might consider changing the rule of what's listable and begin listing them.
But so far there has been little to no market for any of these, thus making listing them in the first place much more of a novelty to the collectors who find them than actual useful information for the die variety market at large.
I have about the same thought regarding the hundreds of 'doubled eyelid' doubled dies I see every year. I keep them in tubes but don't bother listing them because as of yet I have never had anyone come to me wanting any of them. Most of the doubled eyelids that ARE listed were either listed early in the process of discovering they are on literally hundreds of dies, or are a result of doubling that shows elsewhere on the coin as well as the eye and deserve to be listed at a premium.
The 'doubled column' DDRs are a novelty - as a type they are extremely common. I find one in nearly every circulated roll I go through. But the sheer number of different dies affected is daunting to say the least. There are many, MANY of them for which only the discovery coin is known to exist simply because nobody has taken the hundreds of hours required to sit down and list all of them with photographs and marker information.
Additionally, even though many attempts have been made to create a market for them by listing them on
ebay and other websites, there have been few if any bites - mainly because they are not only a relatively new discovery, but because everybody who looks for them finds an example or two to satisfy their curiosity. There remains very little reason for MOST collectors to bother trying to buy or find hundreds of them to "complete" a full set.
So yeah...they probably are collectible to a point. They probably are a neat curiosity to keep. They are common as a die variety type, even though individual dies are scarce and finding all of them would be nearly impossible.