Low denomination money tend to be coins because low denominations are exchanged more often therefore a low denomination paper money would wear out quickly.
But doesn't this argument transfer to higher denominations as well? Why don't we make all cash as coins then?
It's well known if the intrinsic value of a coin goes above the face value there is a danger of melting the coin down for the metal. But what about for the other extreme where the face value is much higher than the metal value. What deters issuers from minting high face value coins?