I tried starting a website a while back that would give reliable, unbiased information on a certain class of goods and services.
I looked at my competitors and saw that most of them were obviously shilling for the company that was paying them the most, which was never the best. I figured by being the most honest I could be the most trusted and win out.
The trouble is, the best companies would rely upon word of mouth. Promoting them wouldn't get me paid a dime. Honesty would benefit them, but not me.
Getting traffic, meanwhile, I realized would cost me money.
That's when I realized that the only way to get a non negative margin in that industry was to sacrifice your objectivity (which is what everyone did).
Theoretically you could charge users for this I guess, like Which? magazine does but I couldn't see a straightforward route to that point that wouldn't involve burning a lot of capital I didn't have. The chicken/egg problem rose its ugly head again.
I gave up soon after.