"...Do you carry a couple hundred ones around at one time?..."
I was referring to a prior comment about making larger denomination coins. Ten $20 coins would still have some heft.
Most vending machines accept $1 coins. Many have a more or less triangular sticker on them saying "accepts the gold dollar" or some such. The vending machine companies have been major supporters of dollar coins. I'd love to see a $2 coin like they have in Canada, the "toonie." It has sort of an inset center, looks like one coin surrounded by another (see below). And it's not too close in size to another coin.
I think Wal-Mart was in on passing out Susan Bs as change, till that collapsed. Once burned, twice wary.
People will never accept a cashless society. Tips, payments you don't want the gov't to know about (drug deals, off book income, etc) and convenience of not troubling with electronic transactions will keep "cashless" a dream.