Well it does help that he probably has no need for any extra income.
If this were the same for some other person who sees that money is being possibly taken out of his pocket because of someone else using his likeness without his permission, and he isn't quite set for life money wise the reaction might be understandably quite different.
I'm sure he's rich, but he never earned the kind of money other A listers earned, the tens of millions per film. And many other actors seem to have an unquenchable desire for more.
His lack of an agent and the difficulty of getting him to agree to actually do a film suggests that money is not a motivator for him generally.
If this were the same for some other person who sees that money is being possibly taken out of his pocket because of someone else using his likeness without his permission, and he isn't quite set for life money wise the reaction might be understandably quite different.