As someone in the advertising, television commercial creation field, I can tell you ads do work, if they're well designed and resonate with their target audience. The :30 commercials, in part, help to finance this wonderful game. Just like the ones on your TV help to finance "Dancing with the Stars", etc. Those sets, costumes and judges aren't free.
WGT might do a better job putting up ads that the individual viewer might better relate to. They should mine all those surveys everyone takes!