They say you have to spend money in order to make money. The problem for Yelp is that they may be spending too much money compared to what they’re earning. This is common for publicly-traded companies, but in their case they may be spending too much compared to how much they have the potential to make, a prospect that nobody at the company and few on Wall Street are willing to entertain. There is definitely growth-potential for whoever can do well in the local listings and recommendations industry. Mobile devices, the Apple products in particular, rely on Yelp as a way for users to find the best sushi…