The most I've paid for a pair of noise isolating earbuds is $75. They're skullcandy's full metal jacket audiophile green. They came with a lifetime warranty, and the cords are braided nylon instead of rubber(I've not had a single tangle with these in almost a year of ownership.) The quality of sound is definitely superior to a previous pair I had from Skullcandy that i paid about $20 for.
Something to remember while looking at the £10K speaker
: its not the size/quality of the driver
so much as the format of the audio. WAV offers the highest quality available for digital music (that I'm aware of).
I listen to a large number of live streamed shows from across the world on Digitally Imported Radio. When listening from home you are given options to select what format you would like to stream. You can definitely hear the difference between 64k streams and the 264k streams.
IMHO spending £
10k on a single speaker is downright ridiculous even in a studio environment.