You are free to have your opinion. I agree with his wife that the guy is a fool.
Ryne Sandberg walked away from his 2 biggest contract years to save his marriage. At that time, I made 2 predictions. First, that he would be headed for divorce within 6 months and second, that he would be back begging for his job the following season. She filed for divorce within 3 weeks and he begged the Cubs for $1 million the following season having forfeited $13 million. If your marriage doesn't work when you spend some time apart and you are rich, more time together isn't the answer.
As far as their lifetime earnings go, a fool and his money shall soon part. Many major leaguers go broke after making big money during their careers. It's a long list. Sandberg and Dempster got a good head start on going broke the way they handled the end of their careers. You can say whatever you like about them, but I think they are 2 fools.