Las Vegas Sands (LVS) shares were up 6% in Thursday after trading after the nation's biggest casino company late Wednesday reported weak fourth quarter earnings but revenue surged as gamblers flocked to its Macau casinos. The report bodes well for smaller rivals Wynn Resorts (WYNN), which reports after the market close Thursday, and MGM Resorts (MGM). The trio have large casinos in Macau, the special gambling enclave on the South China coast