I got my license in 2001, shortly after we bought our first house. I found the process of buying a home so frustrating, like I was being taken advantage of at every turn (wife and I were 29 at the time). When I found out that here in Florida I could get licensed by taking a two-week class (9-to-5) and passing a state exam, I got it. I never intended to be a Realtor and I haven't placed my license with a broker, done referrals, etc. But the education made me a better real estate investor as well as more knowledgeable for when I hire Realtors and buy/sell. (I have zero patience with lousy Realtors.) At least here in Florida, it's pretty inexpensive to renew a license, just $80 or so every two years and it's a brief online course/test. I doubt if it cost me more than $300-400 to get licensed in 2001. I've looked into it today for our two college-age sons and it looks like it would be $600 or so between the class, licensing fees, etc. Neither of them plan to be Realtors either, but it's a good background to have, especially since both plan to major in business.
The best Realtors are the ones who focus on a small area and work their asses off, not just on the nuts and bolts of buying/selling, but marketing and customer service. It's their only job and their full-time, longtime career. Here in Florida, I know so many people who are Realtors when the market is hot and something else when it's not. I would never hire them.