Is this... rage bait?
I'll bite.
What do you consider to be "average"? There was someone on here the other day moaning about her husband's shit wage and he was on £50k+. Pfft!
Look, you're an oncologist, you'll have engaged with plenty of people who are reflecting on what's mattered in their life and what gives their life value.
The trouble is that as people earn more they move their own goal posts, they get bigger houses and fancier cars.
It's pretty blinkered and daft to assume that people who aren't high earners don't have stress. We have plenty of that!
Have I gone on holiday this year? Nope because all that money had to go on house repairs. Do I have a decent car? Nope! I've got a third hand little runabout that I share with my son. Do I have half my income coming from active investment? No. Because there's nothing to invest. It goes in an ISA that pays for Christmas and holidays and car repairs. And a pension that will barely keep my head above water when I reach the ancient age at which I can stop working.
What your wealth gives you and your children is choice and opportunity. We've got three teens, the eldest chose to work rather than complete A Levels and she's doing well, the middle is doing a degree apprenticeship so he doesn't have to take on any student debt and is choosing to live at home so he doesn't have to spend on accommodation, the youngest is planning to do the same but in a different subject.
They've seen us work for average wages with our degrees and postgrads. They've seen financial compromises. They've had limited opportunities to travel. Sure, we do nice things but not the nice things that cost money.
I am rich in life because I am loved and love, I work in a job that matters to my personal values, my volunteering has had a positive impact on my community, I hope I've made good difference in the lives of my friends, family, and the communities I serve in work and volunteering.
£500k would be a lifechanging amount of money. That would pay off the mortgage (which is low), debts (which aren't huge), enable us to get a car that's reliable, allow us to travel, would open up my children to degree options which aren't tied to industry, would give money to invest and grow, would let us move to our hometown which we've been gentrified out of, would help us to give my MIL security, and we'd still have change! £150k would be lifechanging enough.
But it's all relative isn't it? I earn just over £30k and I'm considered wealthy in my immediate community. Our household has more than the majority of families at my kids' school growing up. I'm involved in a local charity which supports people experiencing poverty, isolation, poor mental health, lack of opportunity etc. We have food projects, social hubs, councilling and all sorts. Will I moan to them about my shitty car? No way! Do I thank my blessings that despite having no money for a holiday, we have family and friends who gave us the accomodation to have a break away from our home? Totally.