WHY is the RCA CTC-44 SO RARE today??

[rca2000]

In another post, I spoke about finding and saving an RCA CTC 44 set last Friday. I THOUGHT it was a CTC-40, cause of the "trans vista color" badge, BUT I was VERY pleasantly surprised to find out it is a CTC-44 instead. A VERY nice cabinet with folding doors, and speakers on each side. Not sure it it is remote or not yet, but looks like a matrix tube from the color of the phospor.

SO--WHY is it SO hard to find a CTC-44 today?? They seem MUCH harder to find than a CTC 40, which is nearly identical, save for a tube HV rect. I believe they must have been expensive--, and they were only made for 1971, and so, fewer were made. BUT--the CTC-40 is MUCH more common, and even the slightly older CTC-47, the RCA2000 set, at least for ME--has been easier to find!! I have ONE other 44, and I drove a LONG way to get it. It is in a MUCH less fancy cabinet, but still pretty nice. This one, it was almost in my back yard, --Monroe Ohio, about 20 miles away from me!!

Anyone else out there have a 44, or know why they seem so rare?? Or--is that just "around here"?