We can't know which reviews are truthful. Presumably some are, some aren't. Obviously allowing the business owner to make that determination is dubious.
Reviews are BS anyway, I don't know you therefore why on earth would I listen to your opinion on something?
Because you trust them? Just as one can on news sites find a journalist that speaks to you, one can find and follow reviewers that do the same.
PS $5 a review? Seems expensive.
Maybe reread my post, preferably in context.