This is why you should start the conversation with "I have drawn up a plan to save the company $14M per year. I will execute this plan in exchange for $7M upon completion."

If they say no then just go back to your regular duties.

Very few companies would make this deal at 0.7M, 0.07M, or even 0.007M. Direct sharing a % of savings with the responsible employee is simply not the way most companies work. Consultants, now, that's different...

For a slice of 7M, just quit and come back as consultant.

Because blackmail is an effective salary negotiation tactic?

Learned a lesson that you only have to "spend" (forgo) $250 to cause that company $14m in losses (that you could have prevented)

But was that your job? Because if so, you really got salary+bonus. And if you'd found nothing you'd still have got salary. So you can look at it several ways.