It can't be about the money. Otherwise he wouldn't have spent so much of it trying to kill her. He could've just gone of and enjoyed himself. The compamy that paid the money no longer exists.
He wants her dead and I think he would spend every dime to accomplish that.
Every thing he does glares with unbridled hatred for Terri and her family.
His mission in life is to cause them as much pain, suffering, and indignity as he can.
What could drive him so that he'd blow all that money trying to kill Terri. The only thing that makes sense is that she has a story to tell about attempted murder.