So how many use MM cartridge and intend to keep it that way ?

I can list some of the very best MM/MI/MF from my own collection:

Glanz MF61
AT-ML180 OCC
Grace F-14 Exellent (w/F12B stylus)
Grace F-14 LC-OFC
Grace LEVEL-II BR/MR
AT-ML170 OFC
AT-20SL
Garrott P77 
Joseph Grado Signature TXZ
Pioneer PC-1000 mk2
Stanton W.O.S. 
Victor X-1II
Victor-X1IIE 
Technics 205c mk4 

I run two TT's, one's setup for MC and the other MC or MM but mostly MM.   Which I use is based on the LP I'm playing.  Each type of cartridge flavors the meal in it's own unique way.  

1 turntable, 3 arms, 3 cartridges (MM, MI, MC).

I'm weird, I use old Pickering and Stanton cartridge bodies (I have quite a stockpile) with new JICO Shibata stylii in 'em. Sounds right to me with my old jazz records. I've owned several MCs and other MMS.