Straight forward answer this is not about gambling ruining his career.
This is a pour case of greed and for sure double dipping is a big offense, it means you cheating everyone at your own table, players are meant to stay off from such actions.
So let not blame this on gambling, but its on him all the way.
We can say that gambling ruined his career or life had he been found addicted to gambling and is spending all his money away. But what he did is taking advantage of his position to earn more money. He is not the one gambling himself but instead he is controlling the game for those who are betting on him.
But yes I agree this is greedy. Makes you question why he would ruin a perfectly good thing? Just because of greed? Possibly. What a shame. But let's not generalize gambling to compare to this.