I think the problem is since the edition of full act tz's most ppl have been playing on warlocks and with warlocks the mf easter egg is annoying to setup because you need no merc or demon summon, so effectively you need to kill ur demon every game which people do not like to do
i think it's been one of the more interesting elements of full game clears, even tho right now with warlock so busted it's a moot point.
you can do 400mf on warlock and clear without it,
or you can max out dps / surv on something else, still clear slower and have 4200mf which barely feels better than 400.
after the patch it might be a thing worth considering more than a novelty.