Why does anyone buy anything?
Why buy a £100000 Porsche when you could buy a Dacia?
Why buy a £1500 GPU over a £100 one?
Why buy a £5000 camera over a £50 one?
And so on.
You can pay thousands just for a coffee machine, wouldn't be my cup of tea to spend so much, but people can and do, and out of all the things people spend money on, I'd rate coffee as being right up there.