Billy Joel Heads South

I haven't seen Billy Joel in concert in many years and I'd like to -- especially one of his double bills with Elton John that I somehow missed. Joel's just added a batch of dates in the South to his current tour. But here's what I don't understand: if he's bored with pop music and never wants to write another song, why isn't it even more boring to keep singing the same old songs night after night after night?