If it fails: it costs tens of thousands of dollars and they leave my severed head on the flagpole outside as a warning to others not to take risks like that.
Hmmmm. $5 vs certain death. That's a tough one.
Like Scott Adams says on risk vs reward:
For a manager: Success: you get tons of money. Fail: someone under you gets laid off.
For an engineer: Success: you get a handsome certificate, suitable for framing. Fail: think Space Shuttle Challenger, Columbia, Hyatt Regency walkway. Money lost, possibly large numbers of people die.
Tends to give you a different view of the whole risk/reward continuum.