In my case, I don't see the point of proving to someone that I can do things. I agree with Amy when she said that she would trust the badges, so I do see the value in that. I think you can WWOOF to get skills or, my preference, just get a job doing what you want to learn. Get paid to learn and get lots of hands-on experience, unless you want to learn soccer.
I agree with many of the issues people have raised. The SKIP idea doesn't appeal to me at all. I think planning to inherit a property from someone you're unrelated to can be a very uncertain prospect in more than a few cases. Personally, I would rather figure out a way to buy or rent land so that I don't have to worry about the rug getting pulled out from under me.