The markup doesn't necessarily make sense, unconditionally, because there's also the your own adaptations to the company to consider. If their environment makes

The markup doesn't necessarily make sense, unconditionally, because there's also the your own adaptations to the company to consider. If their environment makes you reasonably comfortable, that's a risk mitigation versus other jobs that's worth something to most people. Also, few people are truly indispensable. In all my time working, I've never seen a company fall apart from the loss of one important person. In fact, it usually takes a shorter time to cope than anyone anticipates. I do agree with you, In the sense that as an employee, you're in great shape if you're seen at being essential, to some degree; I just don't think you're capturing the entire market dynamic.