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Everyone takes GC for their own reasons, so let me get this straight. You have NOT taken the course, but are challenging others who have, to takeTHEIR TIME to take the tests for your ??? benefit. In what way will that benefit you or more to the point us?

You are the only one who can determine what you will lose out on if you dont take GC. THE COURSE HAS A MONEY BACK GUARANTEE!!!
If it doesn't help get your money back!

Even if it helps someone else accomplish their goals, which, since no one, or few, answered your "challenge" probably means that increasing their IQ isn't one of their goals, doesn't mean GC will help you. It may not, having a course "help" you is a matter of choice and follow through.