Why exotic stylus not used on MM?

There are not any Exotic Styli on offer at present, especially as outlined in the list above.

These are no longer mysteriously unique or unusual, most who concern themselves with them will be able to recite the unique dimension for each type, whether it is an artificial grown raw material, as well as where to acquire one or all listed.

One Styli that is possibly closer to the used Terminology 'Exotic' is the Swiss Produced 'Black Diamond'. The part has certainly being assessed for being a suitable replacement part for the above listed Styli.

It is early days yet for this part, so it will be interesting to see how differing dimensions and refinements are produced for the part .   

OP’s definition of exotic is indefensible. By any rational definition, Replikant, Gyger, SAS, and Microline, Micro Ridge and Shibata all quality as exotic.  Not exotic…all variations of conical and elliptical. Plenty of exotic styli have been made for MM and MI generators. From yesteryear there was Stereohedron by Pickering.  The ADC ZLM used an exotic profile. I run a Shure V15 Type V with an SAS stylus by Jico on my Well Tempered TT/TA.  With carefully adjusted VTA it traces everything. 

Can't add anything to Raul's post. I have two of these cartridges now. The Soundsmith Voice and the Clearaudio Charisma which uses the stylus/cantilever assembly of the $16K Goldfinger. 

I have a rega rb300 arm on a michell gyrodec. I have analog devices op amps used ss phono stage and pre amplifier. 
I was using Ortofon kontrapunkt b then I put a black
My expectation was that kontrapunkt b would be better
Kontrapunkt b has better bass, tonal balance is in the mid-low than black
Black is vivid, real, airy, tonal balance mid-high than b
Overall, there was a big difference in the sound in favor of black.
My choice was black without hesitation because of it's there feel.
That got me thinking a bit about the overall mm-mc difference
That's why I felt compelled to ask this question.

'Exotic' has been the go to enticement in the commercial world of HiFi for a very long time, it runs parallel with esoteric, in relation to suggesting there is an exclusivity in being enabled to experience the commercially offered item.

It sure does help with justifying parting with ones funds, and such unobtainable, fantastical, attachments to a product, does justifiably make the Bank Account feel a little emptier and unrecoverable when the unobtainable has been paid for.    

The fact that in relation to Styli, these parts being discussed underwent an extra set of control parameters to achieve their form in an earlier era of marketing, in todays market, there are multiple reserves stockpiled and readily produced, does somewhat seem to have an impact which changes the marketing spiel attached to such parts from an earlier period.

Such parts are no longer restricted to be acquired in any manner, and these can be acquired with relative ease when sought out. 

Most individuals, if so wished, can be putting them to use across a broad selection of owned products, this in itself takes away the allure of the 'Exotic' and the term 'commonly available' will be a more suitable term in the modern market. 

I am not going to stand in the way of anybody that wants to carry on with the allure of a marketing spiel and maintain the term 'Exotic' for what is now a very commonly available part.