Check this thread out too!
http://www.maast.org/forums/showthread.php?t=39600

At meetings anyone can participate in raffles (cost $) but Charter Members at meetings are entered for door prizes (free) automatically.

It also allows you to post in the charter membership forum, photography forum, and the Charter FS/trade forum.

Charters can vote in BOD and special elections.

Discounts with certain LFS's and on-line sponsors.

Free/discounted rates to MAAST events. For example, the SA Zoo Event last year http://www.maast.org/forums/showthread.php?t=36989.

You can enter and be nominated for TOTM then for TOTY which, as Jim pointed out, won $1000 worth of prizes and gift certificates.

There is lots more, but thats right off the top of my head. HTHs