I think it needs to be large enough to be a real deterrent. So it needs to be large enough that there is a real risk of turning substantial profit into substantial loss. "What if we get sued for $existentiallyLargeAmount?" needs to be part of the business math when deciding whether to tell lies for profit.
"More money than exists in the world" would clearly be too much. But I'm absolutely fine with a company and its chief officers being left penniless for such behavior. So I'm definitely fine with taking everything the company has, taking everything the chief officers have, and possibly adding a bit of debt on top of that.