Hahaha - couldn't resist smiling at this thread. I've watched a few of these now and then and they do often irritate me. I too wonder what kind of money some of them have - and how it's been earned. It's definitely different money from ours!
As to a large kitchen....we've lived in our perfectly ordinary 30s semi in unfashionable Suburbia since 1983. We must have one of the smallest kitchens I've ever seen, but I still managed to produce good meals in it whilst our children were growing up and I still do - not an Aga in sight (it would totally fill our kitchen). We've never had a dishwasher and I don't want one now, as it would mean losing cupboard space. We have been trying to get estimates for a new kitchen for the last 3 years - and we've been gobsmacked at the prices even for our tiny space. We could try and extend, but the cost of that for gaining an extra foot or two is beyond us, so we won't bother - makes no sense when there's just us two here, mostly. We could have moved to a larger house years ago but decided we'd rather have the money to do things with the children rather than mortgaging ourselves up to the hilt with no spare cash. We don't regret that decision, BUT......
I'm rather prone to envy (NOT a good habit, I know, I KNOW) so watching these programmes sometimes makes me feel rather....well, challenged, to say the least, and a bit inadequate. But then I remember I am lucky to have any roof over my head and a home to live in. And I don't think these programmes tell it like it really is - it's sanitised and highly edited, as others have already noted, to create an illusion for others to covet.
Best watched with one's tongue firmly in one's cheek, innit 