I am not sure if the posts are self-selecting, but a lot of us aim to buy sustainably and ethically and take some trouble & expense to do so.
I like to think that spending a little more is keeping our local and ethical producers going, and it will be the last thing to go from the budget.
My bill is actually nearer £80-90 for 2 of us. That includes feeding family members at least once a week, having people to dinner, making cakes for local good causes, alcohol, and 2 take-aways a month (DH's Indian fix and my essential fish-and-chips).
We rarely eat out, and some of this money goes on 'luxuries' to eat at home instead. We have a fishmonger come to our local farmers' market - this weekend we may well buy a lobster at £20, and a bottle of good wine for £12. Extravagant in a 'housekeeping' budget, but an indifferent meal out would cost more. And the lobster shell goes for stock. These would, of course, be the first things to go, although I'd keep buying the cheaper fish from him.
My lovely raised bed and a few pots give me herbs, salad & greens all year round.
And yes, steak once a month (my butcher does a very good cut from the rump) but cheaper slow cooked cuts most of the time.
I am an obsessive stock maker, and use my freezer for that. Onion skins, leek ends, any soft carrots, and stringy celery all go in, along with chicken carcasses, bones from a roast etc. Then I can make a chicken stock, fish stock, or general stock. The stock also adds flavour to one of my favourite meals - the peasant staple of slow cooked pulses with some sausage and/or ham hock.