Gothamist, a metro website company, founded in 2003, now has 13 city-specific websites, which reach 2.7 million unique readers a month, according to Quantcast. For a long time, in my opinion, Gothamist was stubborn about growing as a business. Its publisher, Jake Dobkin, did much of the business himself, and didn't think the math worked out to have full-time ad salespeople. More recently, that math has apparently changed, and now the goal is to have as many ad salespeople as can support themselves. 16 million pageviews a month is, in the web business, a totally decent amount of inventory to sell. And for a larger media company that [...]