Groupon Inc (NASDAQ:GRPN) may have been right to turn down Google Inc (NASDAQ:GRPN)’s buyout offer a few years ago, as its total value has just crossed $7 billion, well over the $6 billion that Google had offered back in 2010. Groupon has had a rocky few years, but new management has brought down expenses and renewed investors’ confidence in the company’s ability to hit growth targets. When Groupon first decided to stay independent when Google was offering $5.3 billion plus a $700,000 earnout, most people criticized the owner as being naïve or arrogant, acting as if the only purpose of starting…