A subtler effect is the income vs cost disparity. Suppose you make 60k and consider 50k to be a minimum income to live comfortably well a 70k job doubles your disposable income which is a big deal. Now suppose you make 120k and get a similar percentage bump to 140k. Except your minimum standard of living is still 50k. Sure, it's a larger Monitary increase but it's no where near doubling your disposable income and would have minimal lifestyle impacts.