"Pocket" listing, not in sellers best interest!

With the market being more of a seller’s market, I am seeing more and more “pocket” listings. "Pocket" means the listing agent is not putting the listing on the MLS and possibly other forms of real estate advertising.
I don’t care how you cut it; this practice does not have the seller’s best interest at heart.
http://www.realtor.com/advice/3-concerns-pocket-listings-every-home-seller-consider/