If you have a business, you want to get listed on Yelp! You may not use the software, but some people do, and they use it religiously (and I don’t mean they’ll kill you over it). By listing your business on Yelp. you’re putting yourself on the map. From here, you also need to start using Yelp! Write reviews of places you go. It’ll be worth it in the long run.
Soon, you’ll have a dozen or so reviews under your belt and can hire yourself out as a Yelp! reviewer. There are ethical and moral questions to doing this, but the title of this piece is “ways to make money,” not “ethical ways to make money,” and I am a former Bank of America/Countrywide employee, so what’d you expect?