Companies that do not accept listings are typically known as EBAs or Exclusive Buyer's Agents.
They feel that by only representing buyers they are able to deliver a higher and purer level of representation than traditional companies that work with both.
Like anything, there is disagreement in the real estate community about this concept.
Personally I would rather have the listing because even if a buyers agent sells it I still get paid plus I have the best opportunity to sell it myself and earn all the commission.
You can put a lot more signs in yards than you can buyers in your car.
Why not consider working in partnership with a more experienced agent letting them pay part of your expenses in exchange for you getting a bit smaller commission initially until you get more established and build up some cash reserves.
I know several agents in my office that work buyers for heavy listing agents and do very, very well.
------------------
Jim Lee, CRS, ABR, GRI, e-PRO
Realty Executives Associates
Knoxville, Tennessee
http://www.KnoxvilleMLS.com Jim@KnoxvilleMLS.com 1999 REALTOR of the year, Knoxville Association of REALTORS
I am not an attorney and am not giving you any legal advice. This response is only given for information purposes and should not be construed or substituted for legal advice.