[TaxMechanick]

Yes, I believe pins and sheet music, for example, will have their day (again) at some point. The market is thin, and all it takes is a few serious collectors, either enjoying them for what they are or otherwise just believing there is good future value in acquiring them...
Personally, I like both areas, and, since I buy what I like (and enjoy what I collect), I'm happy to be the proud owner of some...

Using the Ty Cobb King of Clubs Sheet Music as an example, at one point I'll say 20+ years ago, whenever it came up for sale I recollect it was about a $3K-4K piece in reasonable condition. More recently, in say going back 2-10 years ago when it has come up for sale, it often went for under $1K. Over the last couple of years, I do not recollect seeing examples for sale (perhaps I remember 1 example in really rough shape), so I'm not sure what price it would fetch in post-covid times, with cards of Cobb, for example, skyrocketing? I suspect it could fetch some more, but certainly not proportunately so...

Regarding pins, P2s and other relatively common issues, from my view, I believe these issues have remained relatively firm with a solid collector base.

I'll use PM1s as an example... A number of years ago, Heritage had a small find in immaculate condition (I recollect perhaps 12 or so examples),that went for really strong proces relative to prior sales. However, there was a reason for that, as there were a couple or few really motivated buyers then. Since then, not so much... I haverecenly seen a few Cobb's offered for auction, none is so nice condition. Prices were not strong, as I expected. But, then again, Cobb is one of the more common (for the issue) players. Many other players, you rarely see example of, so I'm not sure...? Again, all it takes...

Another area I enjoy collecting are cigar labels (not so much so on the boxes with the labels on them as these are difficult to store and care for). Many of the labels are quite scarce or even rare or ultra rare with examples of 1 or just a few, and the beauty of the lithography just pops for me. These include ultra rare process proofs and scarce or rare salesman sample labels. I enjoy baseball and other sports (as football) more than others, but, I'm open to some other historical personalities and other americana-related subjects.

(To build on what Jay said) I suppose I'm a non-lemming, but, (as others have said) I buy what I like...