I book the profits in BTC, I just choose to do it with the BTC:ETH and BTC:LTC pairs rather than soiling myself with the lowest of shitcoins...USD.
LOL - calling USD coins made me a lot of questions:
1) Does anyone know where to buy the USD miners?
2) Will difficult rise?
3) What algorithm use the USD?
1) no need, just be a well connected corporate bank and the federal reserve will loan you an infinite supply at ZIRP
2) never seems to, in fact they seem to be ever easier to create
3) USD uses the ctrl+P protocol, the Fed chair simply selects a number and presses ctrl P on their keyboard