SEO's in this place, myself being one of them, offer free advice and help to people with issues. Isn't that enough? If you want to know if I'm any good - say if you are going to hire me - then I'll provide references
When I give advice in here it's often not implemented. It's often not implemented because the people have sites that are inflexible (thanks to the shocking state of the web design profession). The free advice people get in here works, I see no reason to use even more of my spare time to prove I know what I'm doing or what I say is valid. As they say in Dragon's Den - I'm out, but I'll still be around to help those in need
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