Seems perfectly reasonable, the reward points system means people who win a lot can play for free, which is great if the top owners are joining lots of new leagues and helping to keep the site robust, but if the top owners are taking most of their credits off the site for what's effectively a cash prize it encourages treating WIS less as a fun, communal experience and more like online poker, where the sharks are just trying to hoover up all the money and spend it on themselves.