As someone very poor, for me good life means having money to the point where my choices are not based around it.
Imho every time you access the next step of the ladder you'll have a few months of happiness and fall right back to where you were. Money is important if you either don't have enough to meet your basic needs or have so much that you don't have to worry about it 1 second in your life (99.9% of people won't reach that state). Every steps in between is the same with extra distractions that won't do much, if anything at…
There's things other than lifestyle creep. For example, many families tend to increase their income as they get older. But the expenses also go up. Having one kid, vs 2 - 3 later on, or kid expenses when they are young vs. teenage years (where you now have to worry about increased car insurance, getting them vehicles, etc). And upgrading housing as the family grows. The effect is that your income constantly seems to be outpaced by increasing and recurring expenses.
So what happens is parents get into the mindset of doing without, so their kids can thrive. And when problems come up, they will sacrifice so that additional money can be thrown at fixing those problems. This doesn't let up until the kids are grown, and then you can sell the house and downsize. All of a sudden, your cars are paid off, the kids are doing good on their own (or you've disowned them), your housing costs is lower because you moved to a smaller house, which means utility bills are smaller too. This is now the point where people hit midlife crisis, they have surplus money and have pent up demand to "treat themselves" so go out and buy something expensive (sports car, motor home, boat, etc). And the tightened budget stress starts all over again.