Here is my take... Most who take classes are looking to "strike the gold".. as was said above. Gurus teach no risk, all reward and a walk in the park. I know many of them and some have more merits than others.. and some have none at all.
This is what I can tell you: I can barely turn a screwdriver, I have never painted even 1 wall and if my sink is dripping I am calling a plumber. That being said I work 70 hrs a week as a full time RE investor. Life is good and there is money to be made but nothing comes for free. There is no magic pill. I hire people to do my labor not because I could not learn it myself but because it is not the most efficient use of my time. I have nearly 100 units and spend my time on how to sell some and how to buy more as cheaply as possible. I spend my time on providing deals to my buyers that will make them want to buy more deals. I spend my time making relationships with sellers that make them think of me 1st when the need to dump an asset. I love what I do but there is no "secret" to millions!
All this being said I have never spent a nickel on "guru" classes.. but I am actually real close to making a deal with 2 of them.. one who can help simplify my processes and one who can help set up a private equity firm.. There is some substance to some programs out there. Just make sure the deal works for both of you.