Have you ever been let go from a job, only for them to beg you to come back as you're the only one who knows how to do the job?

This happened to me when I was in my mid 20's. I worked for a major call center as an IT person. Major like they handled the billing for two of the four (at the time there were four) cellular carriers, and a few other companies.

Anyway I figured out how to automate a big chunk of my job, leaving me time to solve other issues and do systems upgrades. Well my boss felt I wasn't doing enough work so he chose to let me go. A week alter I'm getting a call from them telling me all the problems they are having and no one can figure out my automation, and the other stuff I was doing was piling up. I politely yet firmly advised I would come back under the following conditions, wanted more money a lot more. And I would only come back as an independent consultant not as an employee. My billed rate was 5k per hour billed in 4 hour increments, billed up front every day. Meaning no waiting till the pay period.

Suffice it to say they refused, and it didn't matter as I had already accepted a different position making 4 times my old salary. Instead they had to have someone come in and fix everything which costed them what I would have cost over a period of 20 years. Something like 250 million dollars. So instead of paying me they paid a ton more to someone else. Less than three years later they were bankrupt.
Have you ever been let go from a job, only for them to beg you to come back as you're the only one who knows how to do the job?
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