A few years ago I recognised I was seriously undervalued in my job.
I asked for a £10k pay rise. This is how much I knew it would cost to recruit my replacement.
I offered to commit to staying for 2 years if they paid this.
They didn't so I looked for a new job. Within a few months I had one paying £35k more.
In the last 2 years pay rises mean i now earn £45k more than my last job.