Birdsgottafly I suspect you probably live very close to me. The issue with poverty, even if it's only relatively short-term, is that it's so bloody hard to get out of - because the only options for you (as you're poor) are the expensive ones.
So fridge suddenly dies? Littlewoods if you're lucky enough to have an account, Brighthouse if you're not: and even if you pay your bill in full every month with a catalogue, the prices are still higher than on the high street - but you are being charged the premium for the option to pay at the end of the month (or in instalments, with premium rate interest on top, if you can't clear the bill when you're paid).
It took me years to get out of the debt I accrued when on benefits for two years- and I wasn't living high on the hog.
I personally wouldn't buy a PS4, as I have no interest whatsoever in games - and I don't have satellite television because I don't have a television at all: but your point about cheap entertainment is absolutely spot on. My NDN has Sky for exactly this reason- I know she struggles to pay it every month, but she literally has no other form of entertainment. She's unable to read, and has a night out once in a blue moon, and doesn't smoke/drink/drug so has no other form of escape.
That said - as OP and her DP were both in full-time employment at the time of the purchase, it might have made more sense to buy it outright, without credit, having saved up first. But they didn't - and I suspect she won't make this mistake again. I still think, though, as it's his, and they are a couple, it wouldn't harm him to contribute.