Why is the Shelter 501 mono so expensive?


Rainy day and I am chilling listening to records. I have a shelter 501mkII, my second, and I've listened to a few mono pressings that I really enjoy. I am wondering about a mono cartridge. In looking into this the Shelter 501 mono is almost twice the price of the similar stereo cart. Other than units sold I can't imagine that there is a lot of difference between the two. Any thoughts?
davt
They think anyone who would want a mono cartridge will pay extra, I doubt that demand is driving up prices and I can't see any extra costs involved.
If you have a massive enough arm, the Denon DL-102 is a true mono cartridge that will give you the warmth that you have with the Shelter. It is much less expensive, but it might be a viable alternative.
Possibly the 501 Mono versions are created to order by converting the standard stereo version to mono. This requires labor = money.
Perhaps part of the build process with the stereo version cannot be automated in the mono version? (or is not because of small runs.)
I am all for blaming greed.. but I think a real event is the cause, not greed.
Also, it may be a price deal for the stereo version (in quantity) is jusy not offered for the mono, and who would carry 10 mono, or 50, or whatever it is to get the price dealer discount?