By unnecessary I meant the second M in MM is redundant (since M = Mega = 1e6 is enough). And yes I am disappointed, probably just as much as people's use of imperial units :)

Edit:...

>Roman numerals have been used far longer than the SI system has existed

Indeed it has. But has its use as a suffix existed for just as long? BTW I am also disappointed that the people still use Roman numerals :) (also completely unnecessary, the Indo-Arabic number system is "better").