Yeah, MM is a pretty important quest for many upper-level quests. (For example, RFD is a must for any account with more than 40 def, so might as well get MM out of the way now.)
Dragon Scimmy gets about 5-15k more exp/hr (depending on str) than a Dragon Long. It's definitely worth doing MM. There are plenty of trusted questers who will do MM for $3ish and a lot of free questers who will do it, too.