I'm currently sitting on what to me is wealth beyond my wildest imagination.
In MN terms, it's nothing. But I have had over two grand of less than nothings before now - and three occasions where I've been at the brink of everything crumbling, only to miraculously pull something out of the bag to save the day (and then gone straight back to having nothing, just not less than nothing for a couple of months). I also grew up in a squalid house with nothing because there was no money. I was The Poor Kid the others mocked.
The first time I had £36 in my account the day before payday felt nice. The first time I had £300 in my account felt better. So I launched into three years of 70+ hour weeks to get a bit more of that feeling. The Thursday I looked at my account and saw a thousand pounds felt like the greatest day ever and as I was paid the next day, I then slept until 3.45pm on Saturday, catching up on some of the thirty years of sleepless nights.
I laughed when I saw ten grand. Too tired to do anything with it, mind, and I resented spending anything that might take me below that magical number. I did start to take my foot off the accelerator in terms of overtime, though. Just 50 hour weeks instead. And working every holiday.
I'm years on from that and I still baulk at spending £500. Because it would make the still increasing numbers go down. I've actually taken all my leave so far since September for the first time and only do about 5-10 hours of overtime a week. I've even left work on time some days.
But there are still things that objectively I know we need. Flooring upstairs, a not broken bed. But that would mean spending money and the numbers would go down. I don't get a buzz from buying, I get a tiny buzz from the numbers going up. I feel safer when the numbers go up.
I'm debt free, I don't have to think about any day to day purchases, I'm not going to have my card declined at the till or my bank account closed after I've been paid with my money disappearing into the banking system for weeks afterwards. I don't need to lie to apply for a loan knowing that I'm going to be using it to service debts incurred on survival, to steal bog roll from work or creatively account for a packet of tampons in petty cash by 'losing' the receipt from the Post Office. I could go on holiday, buy an expensive handbag, spend whatever I wanted on clothes or makeup or decide to go skydiving.
But it's only seeing the numbers going up that gives the safe, warm feeling. Because it could all come crashing down again one day if I ever let those numbers go down.
So yeah, OP, I absolutely get it. I know why I'm doing it and whilst it's not necessary, I think it is a perfectly reasonable reaction to over 40 years of poverty.