The maintenance of a Sell rating suggests that Goldman Sachs does not see a positive outlook for Groupon's stock in the short term. However, the increase in the price target might reflect a slightly less negative view than before, possibly due to some positive developments or better-than-expected performance by the company. Despite the raised target, the Sell rating still implies that the stock's price may decline, which could lead to a negative impact on the stock price in the short term.