You said that you know you are not going to get a dime out of it (which is really too bad and changes things). In that case, the only two points of filing are to keep him locked up and to keep him from walking all over you - which he is doing. The other reason might be to keep him away from your son.

I'm curious what would happen if your son just stopped going to visitations after your ex-husband got out. He owes so much child support that I doubt he could push the issue. Why does your son want him in jail? Is he scared or just angry?

See, I'd be tempted not to keep him in jail if it could be his last chance to see his mom - more for her sake than his. However, if you could not keep him away from your kid, then I would do anything I could to keep him locked up until the boy is 18.

I'm a softy but the kid does come first.