I hear you about that selfishness. My W has a class tomorrow so I need to take care of the kids during the day. In the evening, after W's class ends, the kids need to go to a BD party. Does my W want to go? No - she would rather go shooting with OM and have me take them.
But, if you ever talk custody issues with them, they want sole custody. Just dont make sense to me why they want sole custody if they dont ever do things with the kids. I think it fits right in with the selfish attitude.