Wouldn't that set up a conflict of interest for the review site? I'd trust such a site even less than normal (and normal is pretty close to not at all).
It is possible to exist in this space with a potential conflict, as long as you position yourself appropriately. If your interest is to serve "decent" companies by providing them with interested candidates, it can work.
It'll work fine until the site decides chasing profit is more important than integrity of the system, so probably right around the time they're looking for more funding.