By Diana Olick | CNBC
During the housing crisis, being a real estate agent was about as easy as being a swim instructor in the desert.
That is why so many agents left the business. In fact, membership in the National Association of Realtors went from 1.3 million during the boom years to slightly under 1 million in 2012. Now it is back to just more than 1.2 million, and many of the new members are millennials.