Most of baseball's general managers make between $500k and $2M per season, according to sources. Billy Beane and Josh Byrnes have ownership stakes in the A's and D-Backs respectively, while Brian Cashman as a senior Yankees executive, participates in a potentially lucrative stock-option program, sources say. Cashman, Boston's Theo Epstein and Detroit?s Dave Dombrowski are believed to make more than $2 million. No current GM has even gone ?free agent? since Beane nearly left the A?s after the 2002 season for a five-year, $12.5 million offer from the Red Sox. Nearly eight years later, that $2.5 million average salary still would rank among the game?s highest, if not at the top.