I think that there's generally some 'price compression' which means very expensive components are not necessarily as much better as might be expected. Let's take 3 hypothetical components:
Component A is chucked out in China at a cost of £25 a throw and ends up at £100 in the shops.
Component B costs £250 and retails at £1,000.
Component C costs £1,250 and retails at £5,000.
Now, C might only sell in quantities of 100 per annum, B in quantities of 2,000 and A 200,000 per annum.
So, C costs £1,250 but they only make 100 per year. How much would it cost if it was made in quantities of 200,000?
See what I mean?
Disclaimer: Components A, B and C are fictitious products and bear no relation to costs, prices and quantities of products sold by any real company including ATC or Seventh Veil Loudspeakers - cough, cough.