I've done it all of twice since HC started up; never did it on Live. And I saw someone advertising for it just last night, or maybe the night before? Plus I play during usually dead hours. Still, that is only 3 times. My guess is it doesn't contribute to an accolade that makes min/maxers super happy, and it can't be easily farmed, or maybe doesn't pay out well enough. Lots and lots of stuff in the game gets ignored because of that.
I keep thinking I'm going to start starting more teams myself to get away from the usual TFs, DFB, and Incarnate-level TFs only style we've encouraged with endless farming... still really haven't gotten to it though. Maybe just some random AE stuff (played a fun one last night), but the way only the leader can see all the text is just a pain.