I'm going to assume you've never dealt with this issue, even indirectly. I have not met a single person who has killed someone, and for whom $100M would make slightest difference. If anything, the people I've met would happily pay to undo the act.
The previous poster is just grandstanding here. There clearly exist people who have killed multiple times for much less money. Maybe the first time they didn't know what they were getting into, but that can't apply to later killings.