With her location, Your sister doesn't need to give a "buyer" ALL of the control of her minerals. She may not even need to warrant title forever or question whether her title will be questioned in negotiations. The deal is too one sided if you ask me.
Would you play an hand of poker with a party that demanded you put up an ante but they wouldn't unless they knew they had a winning hand? Never.
Gary L Hutchinson
Minerals Managment