@Conkersinautumn
Lots of people run up debts I guess cars on credit, electronics on monthly payments, house improvements on credit too, they'd rather pay 3 times over than save up and get it cheaper.
I honestly don't think the majority of people with debt actually realise and understand how they pay so much more by buying on debt rather than saving and buying outright.
Over the decades, I've had loads of clients who've "churned" car HP, bank loans, etc., i.e. part exchange after 2 years of a 3 year car hire purchase agreement, "because it was cheaper", i.e. the new monthly repayment is a few quid less than the old, and they genuinely think they've somehow "scammed" the system and got a newer car for less money. They are blind to the fact that the new HP agreement is for 4 years rather than the old one that was for 3, and they're going to end up paying a lot more overall, especially as the old HP agreement had an early settlement penalty that was rolled into the new loan!
Same with loans and mortgages - typical "trick" of the bank/broker to extend the term for another 25 years, add in a shed load of fees to be paid by the loan, add in the early settlement figures for the old loan, and hey-presto, a lower monthly fee, but for several years longer. Nat West used to be terrible for doing that with their business development loans - the bank manager would actively encourage businesses to borrow more for a lower monthly fee, and skate over the term extension - even worse were the early settlement penalties on their business development loans which could be thousands on even a small loan, all rolled into the new loan, so the bank ended up earning interest on their penalties! I think the worst excesses of that are outlawed now, but it still happens on a smaller scale as there are limits etc.
My brother was terrible with credit cards and store cards. He'd regard a credit limit as a target, and would, say, buy a suit with a new store card, then once he got his monthly statement and saw what credit limit they gave him, he'd go back and spend right up to it, but it was "OK" because it only cost him a tenner a month or whatever - he was incapable of understanding how much he'd end up paying over the ten years or so of paying it back at the monthly minimum.