It was either that or Large Member. Now that I've thought about it maybe Massive Member would be even better. Alliteration always wins.
I am the smartest person. My uncle was a great professor at MIT for 40 years...but I'm smarter than him, I'm smarter than anybody*.
*Donald Trump quote. Don't ban me.
I suppose that could happen, but I would find that not many people would have a thread that others deemed worthy of being advertised in, but if they do then maybe just allow it? Theymos already allows users to advertise in threads of importance so this would likely be a good barometer of that without him having to get involved on deciding what is and isn't notable. Alternatively, adverts could just be reported and staff remove them just like we do with off topic posts or ads. Users who repeatedly abuse the position could even be banned from doing so.