Anyone seen the film "Hostel"?
If you take the film's, premise there's a ready-made solution here. Wealthy businessmen pay up to $50,000 to torture and kill people (who've been kidnapped in the film) at the archetypal disused power station.
So there you go, instead of kidnapping innocent backpackers, we could 'donate' certain individuals to the establishment. So double whammy - not only would it save the money to keep them in prison for 35 years, but we'd raise some money for the victims family as well.
To be honest, for Michael Mullen, the bids would probably start at well over £1m!