That particular topic about Yelp and their reviews have been discussed many times on HN. Yelp is a major scam company that absolutely do not care about the business owner. They are in it for the money -doh- and what matters for them is Page Views, and regular users posting more reviews, thus more page views. Their filtering system is a total mess but since it is a secret on how it works they can say whatever they wan…
Unless you're a restaurant or some other establishment frequented by the Yelping community, there's no silver bullet to getting a lot of great reviews. It takes time and probably more than half of the ones you get will be filtered.
That said, I think it's foolish of pretty much everyone to use Yelp ads. They're a complete scam but that's a different topic.