Wizard bundles come out with notable more frequency than Pirate bundles. I suspect the reason is partially economic (far more people are playing Wizard than Pirate) and partially the labor involved (given the differences in the game, I think a developing the moves for a new companion takes far more effort than developing a new pet for Wizard).
The Pirate bundles are consistently very nice ones, when they appear.
While Pirates lags behind in bundle releases, we have far nicer class houses. Take that, you Wizzards.