Why mono?

Purists. Also, a 'true' mono cart has coils that work in the horizontal plan only. Stereo coils work in a 45 degree off axis coupled at 90 degrees. They sort of do the same thing, but the folks who are up in the Audiophile stratosphere, want the cart device to work correctly for mono records. They say it sounds better.
(Be VERY aware that using a horizontal Mono only cart will RUIN your stereo records if you forget and play a stereo record with a horizontal motion only mono cart. Some mono carts have the same movement as stereo carts and will not destroy a stereo LP)
So if you have a multi thousand TT setup, and want perfection.. buy the mono cart.
(there ARE some mono carts that are cheap enough to just try out anyway.
THEN: another issue is does one use the original stylus shape? the spherical stylus? or a line contact stylus in a mono cart? This is also argued about.
I have thought about a mono cart, but have not followed through on it. (mostly because I would want a dedicated TT for it)

Thanks for the information,very well explained.

Wow, that was a great explaination, well played. How on earth would you learn about that unless you are in that business? I always wondered that as well.

I learned it because I was thinking about buying a mono cart. So I did some research.
(Also I have been AROUND in audio since Mono was the only choice, I am like really old.)
The biggest reason not to for me was changing carts just to do the mono cart at times. Too much bother. So IF I got a third TT, one I wanted for mono only, I might do it.

Thanks again, I really don't have that many mono records to take that kind of plunge! I was just curious why Grado makes one.