Your value to your company is also not a linear function of your time there. There are high fixed costs to training, liability, insurance, etc. They are paying

Your value to your company is also not a linear function of your time there. There are high fixed costs to training, liability, insurance, etc. They are paying you to always be available, etc. With that said, I think it's very possible to find a much more easier development job with a lower salary. You should be able to meet performance expectations in very little time.