The doom sayer needs followers who feel endangered and vulnerable. The forecasts of doom make the prophet needed to get through the pending calamity. No one needs a savior if the forecast is for sunny times ahead. By undercutting the sense of security of others, the doom sayer carves out a niche for himself: I will get you through the market panic, the economic collapse, etc. The same dynamic is at work with the seemingly solicitous and chivalrous man who wants his woman dependent upon him.
This is exactly the kind of psychology at play at number of site. The perma bear cult guru and the followers need each other to rationalize and amplify their message. This is also one of the reason why perma bears who are wrong on market directions for many years do not re-examine their bearish bias objectively. It is much easier to externalize the problem by claiming data is manipulated or others do not understand how dangerous the economic conditions are really. The motivations in such cases is not to make money but to attract and keep growing bearish followers which helps the cult leaders derive meaning in their life and get psychological satisfaction.
At a larger contrarian level, do you think market will have a longer term top while bearish bloggers are the most popular blogger. Think about it, tops are marked by bullish sites being most popular. That was the case when market topped in 2000. Currently we have exactly reverse situation. There might be corrections but till the bearish bloggers get dethroned in terms of readership and popularity, we are unlikely to see a longer term top.