IIRC, much of the defense costs were paid for by directors E&O policies and other liability coverage..no longer the case after the conviction..so they'll have to decide if they each want to throw away several million on an appeal....to merely buy some more time...Since the appeals will most likely lose, at some point Skilling and Lay will havbe to decide if they want to leave something for their families..
I rather imagine that they do, especially old-man Lay for whom time is now his most precious asset. Surely these creeps have millions in cash tucked away for a rainy day.