This is it! At my highest career progression, when I was striving to "do better" I got a £6K pay rise to a better job, an upwards move, and was very proud of myself, but the job itself made me utterly miserable.
I'm not stupid, I'm educated, and smart, but the pressure and the responsibility got to me simply because I did not enjoy them. I could not switch off when I came home, I would be planning in my head and even in my dreams.
I was also studying for my post-grad qualification for a really high level profession and I was doing well too. But I realised I actually would hate that life. I would hate the constant pressure and the encroachment on my personal life, so I quit the job and the degree.
I moved back up North and went to an employment agency and they would say 'you are qualified for this job' at a good salary that where I moved to would mean my living standard would have been brilliant and I could have gone up and up.
But I didn't want that. I actually ended up rewriting my CV to downplay my experience and get a really menial role, which I did :D And you know what, I absolutely loved that job. I was on 10K/annum less but was able to do overtime and make it up to only about 5K/annum less as the overtime was paid better and I had no kids so was fine to just keep working as I actually liked being at work!
From then I decided never ever to reach for high career progression again, it just wasn't worth it.
It really isn't about money. Someone can be earning 11K a year but be very happy, leave their work at work, enjoy going there, feel totally confident in what they do (a huge factor in happiness) and have time and mental effort left over for their family and are always present for them.
Then you can have someone on 150K a year but they take their work home, think about work at home, are stressed and irritable and sacrifice time with their children, even if their children have all they want, they will still feel bad for not "being there"
And that's really the crux of it; it's not about the money, it's about what you have to do. If you don't like what you're doing for ONE THIRD of your life, then your life is the dead end, forget about the job.