You still have to go through the process and cost to become a broker, and, as I read it, pay $382 to access the mls. You might as well become a Realtor(put little trademark thingy here). Unless you are going to make a business of it, it seems to make more sense to go with Karchin, or housepad.com, for a posting in the mls.
Sd realtor made good points, and is a straight shooter, as usual.