Yes they do.
I recently tinkered with the terrain editor software and gained a great deal of respect for those who do make maps.  It is tedious, time consuming, and causes hair loss.  
Here's an idea:  Make it worth players while to make maps suitable for the MA (lots of qualifications for MA maps).  If someone can create a map that passes the qualifications set by HTC and gets put into play, why not give them some sort of reward like 6 months free membership.  Just an idea.