the chance of rolling a 12 is 1/36 so you need player's club status or point multipliers which exceed 2.77 (1/36) percent if you choose bubble craps don't pass/pass hedging as your churning method - so the bubble craps slot machine is a better slot machine to use than many other slot machines like Cleopatra or whatever.
Correct there is no dark side BJ bet you can use. It is a non-hedge-able game.
Yes, as Alan stated, the edge in craps comes from the Bar (12) for don't pass bets otherwise craps would be an even game.