[newaccount74]

There is no way to square this circle. If you take payments from the vendors you recommend, you will never be fair. Either you take their payments and don't promote them, then they'll stop paying. Or you take their payments and promote them, then you'll end up doing paid promotion.

If you want to make a "fair" recommendation site, you need to find some other way to monetize. One possibility would be to charge potential customers. I believe there are people out there who want fair recommendations, I'm just have no idea how to get them to pay.