Investigative journalism? There is definitely an opportunity for a site that allows such reporting.
Perhaps though if somehow you could get companies to pay for investigations into their competitors? Like an anti-advertising model? I presume this would end up a zero-sum game though, and companies would opt to not play at all.
That's the whole point: No one. I care enough about some subjects that I would work on it for an entire year if it meant enough people would read it.