I did avail myself of thread blocking when it first became available, our very OP matey here (aka Pattison) being one of the first beneficiaries. But I soon unblocked everyone, this feature offering little advantage, especially since it doesn't block quotes in replies. I do, however, still block a few members from sending me offensive emails.
As for Supporter & Verified, I rarely even look at that, though I'm both myself. What I mainly read are the words posted in the thread itself, and judge based on that. I've been in these online chats for over 20 years, and at the risk of bragging, I feel comfortable in my ability to evaluate people between the lines. The more years I chat online, the higher my accuracy gets.