Site still seems pretty popular and the best around in my opinion. Why else would all you guys be constantly posting here if it sucked so bad? Just for entertainment? That still gets clicks. I think your “personal” view of one poster is not destroying this site.
I still like interacting with certain posters. Never said I didn't.
But traffic is clearly down. You're right that from the poster perspective that you should just ignore the losers. However, not everyone is going to do that. Some people are just gonna find places to post/interact where there aren't losers. That's just how a free market is going to work for this type of stuff. If you go into the Welch/JC bet thread, you can clearly see several people chose not to do that.
From the site perspective, you need to either A. neuter bad posters or B. ban them. Otherwise you get a situation like the OS in early October when the sports news/events cycle is fairly robust and you can't get a thread to reach the 2nd page.
So if you want SBR/twitter/group texts/whatever to lap you, you just tell your good posters to "ignore" others. If you want your business to thrive, you neuter your bad posters.
Good content breeds more good content. Bad content breeds more bad content.