is there a benefit to brokers in having their listings show up in fewer places?

Incidentally mpc does not list on trulia, streeteasy, et cetera. only nytimes and their own website.
Other Queens local places use MLS - like Century 21, Welcome Home, et cetera.

this is typical in Brooklyn as well. in brooklyn, there are, i think, 3 MLS systems, so it gets confusing. to be on MLS, you have to have an exclusive and some buyers in Brooklyn and Queens do not want to enter into one. the other reason is pure GREED. they want the whole commission themselves.

Ab_11218 -- that is hideously annoying. It is taking so much time to just find the listings let alone assess if I would be interested in looking at them in person. What a waste of time. I suspect in one particular broker's case that he also inflates the prices greatly, I could be wrong of course - I think this in part b/c this broker tries to avoid leaving a listing on the Times too long and doesn't list anywhere else where you can find the date the property was first listed.

I'm sure this is a terribly naive question, but really why can't they just all list with one MLS? Would that be so hard?