Consider during the if and when scenario, when currency is challenged, what do you wish to carry.
90%ers are like USD bills,
.10c = $1.00,
.25c = $3.00,
.50c = $6.00,
$1.00 = $12.00,
rounded out at todays spot.
The 90%ers value may increase in dollars nominally, 5 - 10 times posted amount.
Who walks around shopping now, or used to 40 years ago with a pocket full of Hundies, Ben's, of Double O's ?
Who does that in 2nd & 3rd world countries, or in US equivalent counties ?
I do not, as a cash payer, and traveler.
Not intersted in the risk or knowledge delivered to interested parties, legal or with lack thereof.