The main reason for no high-denom currency is to deter tax evasion. The feds believe the citizens cannot be trusted to report all income from big transactions unless there's a paper trail that the government can view. The 'anti-terrorist' excuse was a handy way to accelerate these plans

It's likely that paper currency will go the way of the slot token, and all private transactions will be by credit or debit card in the future. Which means there will be NO private transactions in the future, save for those settled as barter trades or with gold or silver (or casino chips??).

The feds have already eliminated the Treasury Bill and bearer bond and replaced them with book-keeping entries. Look for a federal account for every citizen in the future which will be used to clear all private transactions. Maybe it will be 2084 instead of 1984 [g].