Replying to the title only.

I've noticed that I now have many speculation thread with ~90% of people ignored.

I think there are many of big posters who only try to raise their post-count to give appearance having some reputation.

I wouldn't be surprised if some 2000-3000 post account would end up being sold to the highest bidders.

SUBs such as Specu... and off-topic are very prone to non-sense postings.  I have no idea why off topic threads should be tolerated if off-topic post are not.

So Just now, I am committing to a 5BTC bounty to develop the "Ignored by # peoples" feature besides usernames.