Im currently on near £200k. I grew up in a mining family in the North East where money was extraordinarily tight. Other OPs are right.. the salary increase comes in increments and I've 'invested' in my career though time or money so for so long I've been paying back debts
My first job out of Uni in 1998 was £8k gross and with crippling £50k debt (my parent weren't able to give me any money so I had to work when I could or rack up debt).
I moved to London for a better job and moved to £12k, then £16k and then £20k. The debt repayments kicked in at £16k and left me back to square one. 95% of my salary was rent and public transport. I remember writing a £30 bouncy cheque for two weeks worth of groceries on the eve of 2000 but I was focused on being promoted at work and moving onto bigger and better things.
Did a load of research as I was keen for a new challenge and better prospects. Found a new job in a new industry but which used my skills and had a much higher earning potential. Salary was now £35k I spent my weekends learning about this new industry to ensure I got the job and I was damn persistent in applications. Interestingly any of the people I worked with then could have moved into that industry but none did. All of them are still there complaining about their pay...
I moved in with my boyfriend and the rent I was paying in a 5 person shared house suddenly shot up now there was two of us. Believe me at no point between £12k and £35k did I feel any richer or have more disposable income! You move tax bands, your rent gets higher, bills get higher, transport more expensive. Suddenly you have to buy furniture! Probably the food I ate went from a packet of super noodles to spag bol and the wine we bought was a little nicer. Our holidays were few and far between. Self catering in Greece once and staying in a friends parents house in France
I moved job again, for £45 then decided to qualify as a lawyer. 4 years later and £25k in debt again I moved to my current legal role. Started on £50k again with a shit ton of debt and after 14 years specialising into a niche area of law I'm now on £200k.
That 14 years has not seen me suddenly become flush with disposable income and buying Maseratis! Rent went up every year. Debt needed to be paid but the Greece holidays turned into 3 weeks in Canada for example. We bought a car. Finally bought the furniture we needed. I was often working away from home for huge stretches (I hated it but knew that was the way to get promoted) so Treated ourselves to lovely dinners, didn't think twice about a night of expensive cocktails or buying a new outfit. Makeup went from Rimmel to Clarins to Chanel.
Importantly though any disposable income went into a house deposit. I was paying £2000 a month on rent and the rest was saved. In reality life doesn't change that much. We never managed to afford to buy in London.....
In reality though the big gains in my salary have been through significant time or money investment in my career. Money investment leaving me in some significant and terrifying debt for large periods. Time investment like requalifying over 4 years part time while holding down a full time stressful job. I've also moved countries twice now for work. It's stressful, unsettling, scary and damn it's expensive! Our latest move (despite being subsidised by the company) cost us £40k
Where I live now is expensive and at 45 I've managed to buy my first house. Yes in a beautiful area but it's fairly modest but right now it takes up 60% of my income because we were so late to the party. My disposable income and my lifestyle feels no different to that when I was on £50k but where it is going has changed! I now have a mortgage rather than rent payments for example and it's twice the cost but that is immensely privileged I realise. We have a 12 year old Honda Civic and a 20 year old knackered Land Rover. What I'm willing to pay for things has gone up. My furniture is more expensive than the first lot I bought in 2004. I've invested in art. We enjoy good food and wine and I'm privileged enough to not look at the cost of anything in a supermarket. And yes I give a lot to many charities both money and time...
The upshot is it's a slow drip of incremental increase in salary but that has come from my time investment (90 hour weeks 300 miles from home for example) or getting into debt to get the next promotion (so the salary increase sometimes barely covers the debt) or being flexible enough to go where the opportunities are and sacrificing your entire savings to do so.