Business and scams happen on other boards too - altcoins, hardware, gambling. DT1 should be more diverse, not less, and having a business interest is not a prerequisite for having good judgement.
And it is currently diverse is it? Seems to me the same people run it. Having business interest is not pre-requisite, no, but it is a lot easier to judge people frivolously when you have no personal financial stake in any of the outcomes. This does however lead to more accurate ratings because they have something to lose. A lot of people here run around judging everyone with nothing at stake themselves.