No, I don't think CBid is "rigging the game." They have established ways to avoid selling for prices they feel are too low (floors for "Specials," Free Fall floor limits, etc.). If they want to protect themselves on the low end, they can do it.
CBid is absolutely the best way to buy cigars if, like me, you are not extremely brand loyal. There are just so many good cigars available at prices that can't be equaled elsewhere. Love it.