Funny enough all of this are not only associated with a gambling addict but cut across anything has to do with addiction, generally too much of anything they said can be very bad, every addict will always put first whatever that are addicted to first before any other thing, and most times it takes one personal decision based on how much they have gotten the experience the hard way other than taken advice from those around them.
Over involvement in anything isn't good at all, there should always be a time to disconnect and take your focus to something else profitable. Addiction can emanate from over expectation from something or an activity, for example in gambling, addiction happens when someone is expecting a huge cashouts from it, disregarding other negative factors or implications that is possible from lack of emotional control and chasing loses.
He expects that gambling must pay him handsomely before he quits. This stubbornness and over expectation has led to the ruins of many people. Moderation in everything is of great importance and not only in gambling since one habit formed can easily spread to other concerns of one's life.