re: "10% of what you make".
Interesting idea. But how do you administer this ?
Here on this website, people are always being cynical about the motivations of suppliers of courses, advice etc.
But the flip side of this, is the providers of the service may be cynical about whether people who sign up will be honest about how much they make, and therefore owe the suppliers of tips !!
How do you see this being administered ?