The answer is yes and no, as with a lot of things.
I once got asked how we afforded to go to a West End Theatre as a family a couple of times a year. One possible answer to the person that asked would have been "by not taking the package holiday abroad you do every year." In fact we could probably go monthly and still be quids in.
Often things are a choice. You can afford to do X which you'd like to do, or you can afford to do Y which you also want to do, but not both.
But the poverty trap is a big thing. For example, the tyre goes on the car. You buy the cheapest tyre at £60. You'll need to replace it again within a year, and that's assuming it doesn't puncture again because being a cheap one, it's both more likely to puncture and if it does puncture more likely to need a new one.
If you could have afforded it, you can pay for the £100 tyre which lasts three years and is less likely to puncture etc.
Or you need more washing powder. You only have £2 to spend on it, so you have to buy the small packet, because you can't afford the packet that's three times the size but only double the price.
And your oven goes wrong. You know it's really getting to the stage that it needs replacing but you can't afford a new one. So you keep getting it repaired at £100 a shot. A new one cost £300 but you don't have that money at any point when it goes wrong. Your neighbour knew hers was going wrong, so she bought one in the 50% off sale before it broke.
It is more expensive to not have money.
If you are struggling for money you can save buy eating cheaply, home repairs, never getting little treats etc. And I'll guess most people have at times had something they're saving up for where they have done that sort of thing. But it's different doing it for a short time, than doing it with no near hope that you will get out of the situation.
I could live off baked potato and butter for a week. I'd be pretty bored with it after a fortnight, after a month I'd be longing for something different and more tasty. If you're trapped with little money, you're looking at doing that for months, possibly years before you could relax, so it feels pointless.