The UK is a weird place when it comes to valuing their people... In the last place I worked at, I left because of a one time bonus (3-ish k) not being paid after delivering and saving the company ****loads of money.
They dragged their feet over that miserable amount (they paid dividends and bought businesses that year)... on the final minute on site they made me a good offer, but by then I was far too ****ed to accept it and left. I've kept in touch and my departure over 3k or so is coming up to 300k in Systems Integrator and consultant fees, downtime and recruitment.
As if it wasn't enough, my departure meant that a lot of projects were put on hold indefinitely which meant that other key positions on site decided to nope out so they wouldn't deal with the fallout without the process control expert in house.
All because of 3k... LOLOL