I just thought of something about the reviewers on the website, how can Lina validate if the reviewers are certified buyer of a specific product? Do you have qualification before someone can write a review on the product?
You do have a good point there buddy. On my own point of view, if LInA will be validating a certain user/buyer. They should be requiring proof of purchase or anything that will prove that the reviewers really own a certain product. But is it really necessary to be a certified buyer before you can give your product review as a user? What if the product was given to you as a gift? I think this will be a great challenge to LInA team because not all products have serial numbers as reference.
In connection with your question about qualification. If you are a plain user, you don't have required qualification. You may post your own quality review about a certain product anytime. But, if you are a Helper, the LInA team requires you to submit your CV and you should have created tons of quality reviews.