Earlier quoted context omitted.
> Why would someone need to pay for 10k in cash? The answer to this is very simple: none of your business. I take strong issue with the word "need." Why do you need that car? That television? That four bedroom house? Why do you need that bow and arrow? For sport, you say? Why not play some ball game instead? Why do you need a chess set when you can play digitally online without killing a tree? Why do you need those f…
Nothing wrong with this point of view, except that it's not shared by Europeans as far as I know (and feel). The "none of your business" doesn't work in the long run.
An anecdote: The 500 euro bank note was originally created because Germans had the habit of paying in cash, even for large purchases like cars, and they had a DM1,000 bank note (which is about EUR500).