Everyone goes to MM because it is the easiest place to find a pick up group at that level. The problem is that the zone can't support that many twinked characters, but druids and wizards don't yet have any group port spells to make going somewhere else feasible. Unrest is always packed too during prime time, so going elsewhere to exp means a long trip to sola, upper guk, cazic, hk, etc. In the face of traveling getting zero exp with the hopes of getting some exp when you get there, getting shitty exp in an overcrowded MM doesn't seem so bad.
Personally, if I'm on an alt and MM is too crowded, I just play something else for awhile.
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