although I have not spent that much, maybe 1/3 of that 20 years ago on a rocky, for people who buy coffees on the high street that cost would rapidly add up ...£500 on a grinder for anyone else is just a status symbol.
(yes -inflation over 20years),
I think the good food processors are like good coffee grinders you can pick up some, robust 2nd hand examples too. - to wit. the 2nd hand kenwood chef I picked up on ebay, as a trial, wouldn't be without either now; long term residuals on a coffee grinder much better than an iphone too.
coffee grinder reviews are very subjective at the moment though - people rarely analyse the grind uniformity and follow the science.