Whatever Mary's and Cher's current net worths are is irrelevant.
The law is the law. Mary Bono had no right to discontinue the royalty payments. I can only assume she got bad legal advice.
If she was left with $4 million on Sonny's death and continues to receive his 50% share of royalties, she should have been able to ensure a comfortable life. (You have to wonder how much the legal fees for this case cost her.)
And whatever Cher is now worth, is down to her own work. No one else's. So it has no bearing on the case.
"" A little learning is a dangerous thing."-Alexander Pope