Let me give you my experience, as I have gone through the Rich Dad workshops.
About a year and a half ago I attended the free workshop. As others have mentioned, it is a marketing technique to get you in so they can sell you the 3 day training. My partner and I went to the free workshop, where they gave you a little bit of info, but promised to reveal it all at the three day workshop, which was $500 and you could bring a guest (another marketing idea). So we split the cost and each paid $250 for the three day seminar. I was really happy and felt that the $250 was worth it. The three day seminar had a lot of info packed into it. Not having a real estate background, I like learning about the different strategies that were available. We also got to play Cashflow twice. If you do not know, Cashflow is like Monopoly on steroids. It teaches you how to use a financial statements, and helps you get an idea for different types of investing.
So on the third day, they had their sales pitch for the "advanced" courses and mentoring. The classes ranged from $5.000-$50,000. My cousin and I decided to purchase the package with 4 classes for $15,000, or $7,500 each. We did not have this money available, so we both put it on a credit card.
After taking the three day class, I then found my local reia and joined. I met so many great real estate investors there. I then began to regret spending the money on the courses. A few months later we purchased our first duplex. I just closed on my second duplex a few months ago.
I have only taken 1 out of the 4 classes that I signed up for, which was called Rich U. It was similar to the three day course, but gave you s little more detail.
So overall, if I had to do it again, I would have gone to the three day course, but would not have signed up for the advanced training. I have been able to get started in real estate without taking those courses. I am all for education and believe it is important, but Rich Dad is a marketing company, not a real estate company. They constantly try to upsell you, and I do not believe provide value for the price.
I am very happy with the Rich Dad/Poor Dad book, as well as the Cashflow game. What I would suggest for you is to join your local reia. You will meet other real estate investors there. Then I would look for some used real estate courses on ebay. I have spent ~$1,000 on ebay and have 6-8 different courses, and well as several books and dvds. These have helped me much more than the $7,500 that I spent on the Rich Dad trainings. Additionally, I had a very hard time getting financed for my first property, since I opened a new credit card and maxed out two credit cards paying for the advanced courses.
That's enough babbling. Feel free to send me a pm if you would like to talk more.