Curiosity question. A while back on eBay, I purchased one of the 2 Albums on One CD: Four Tops b/w Four Tops Second Album.

I believe that there were NUMEROUS double album releases like this, but they seem to be never for sale on eBay. That was the one and only one I have ever seen on eBay. Being as I was unfamiliar with these when they were released, I am wondering why they are so SCARCE and never offered for sale these days.

Does anyone have any thoughts on this? I never knew about these during the period they were issued.

Thank you.