LOL, I know all about that. That was the old days before computers. Anyone looking for properties now are using a computer, and it'll show the listings regardless of what some RE agent prefers to show due to commission percentages.
We have access to five MLSs and I can tell you that if you're searching only one MLS in southern Cal, you're not getting all the listings in the city you're looking for.
You may have the market all figured out, but we are value added to our clients and they seek us out mostly through word of mouth.
PS: the state of Cal association is developing a statewide MLS. We look forward to that.