After reading J Scotts blog, and doing my own calculations, this is how I see it.
Say it only costs you $300 a month in fees. That's $3600 a year. Most listing/buying agent commissions are 2.4-2.5%. Most brokers to my knowledge take half of that. (realtors please chime in, especially in the MN/WI area)
So based on that, at .0125 (1.25% comm) You would have to sell $288,000 worth of homes, to offset that $3600 cost.
If and when I get to a point where I am flipping 2-3 properties a year, and my friends and family ask me to help them buy/sell, then I will probably get my license. Until then, its not worth it for me.
Right now besides my own off-market research and driving for dollars, I have a great agent who sends kickouts to my email.
Find a good agent locally that will work with you, that will do this. For example, I have filters set for specific school districts only, under 150k, single family only, and then also have one set up for multis, and solds (so i can watch my comps).
They may even let you see the full agent views of the listing, but I am not sure if that's illegal or frowned upon among realtors. It never shows that much more anyway, because listing agents are lazy with lender owned listings. On the "solds" you can see the financing info after purchase though, which is fun to know which type of offer/buyer got the deal done.