"I think the doorman is just as important as the guy who owns the building," real estate broker Luis D. Ruiz says in an episode of Bravo's Million Dollar Listing, New York (MDLNY)."Because you never know where a deal is going to come from." (Watch a trailer for the show here.)Ruiz is one of three New York real estate brokers - and reality TV personalities - who make up the cast of the popular and fascinating show that will next air its 6th season.