MarineMax's latest quarter offered evidence that the service mix is becoming more important. Fiscal third-quarter revenue and same-store sales both declined approximately 7%, reflecting continued weakness in marine retail. Gross profit nevertheless increased 9.2% to $218.1 million. Management attributed the improvement partly to higher-margin businesses, including marinas and superyacht services, as well as better boat margins.Premium waterfront capacity is difficult to replicate. New locations face real-es ...