I agree there probably are some good ones that get funding somehow. But if the general consensus is most/many think tanks are independent organizations that think about stuff and publish articles, like authors or philosophers for the common good, they certainly are not.

Also, I would suspect that the bigger the think tank (read well funded) the better chance of getting their article republished. I mean if I started Clubber's think tank about whatever, I doubt I'd get much traction.