Well, priests are human and some even have sex despite being forbidden to do so (although depending on the type of church, not all are forbidden to do so), so I am not surprised that they gamble. In this case, given that he was betting and after winning that amount he has decided to shut down the ministry, it seems to me that he is going to indulge in earthly pleasures for a while.
I agree, even pastors have a wife because there's a belief that they are not allowed to have a intimate relationship with their opposite sex, same with the nun. It's like playing outside even your parents said that you're not allowed to. But I expected that if he really devoted himself as a pastor maybe he'll donate some of his winning to charity. Of course we people have a side where we'd like to feel the enjoyment and excitement to our life so maybe he choose this side. But shutting down the ministry makes me think that he doesn't even want to be a pastor that shutting it down is unnecessary or maybe he'll be doing gambling and no ones gonna look for the ministry.