Let’s look at the Mint deal as an example. Do you think it was the mega thread at FT (and to a lesser extent FWF) that killed it or the blogs?
Nothing to do with either.
It had to do with one incredibly foolish/arrogant individual who took pictures of $$$$$$ in coins and blabbed to the media, which is what ultimately killed it. The ego's need for recognition (on top of rewards) knows no bounds.
Had it not been in the WSJ (twice?) then it would probably still be around as it was for years before that.