How much USD do you keep in your daily life?
You know, USD is of course more widely accepted all over the world,
and if you go to the shops to try to use USD, there ARE some chances they will accept your USD.
But, how much USD do you keep in your daily life?
SO, how much BTC are you going to keep in your daily life?
USD: none. The only times I might have needed it is when travelling, and even then I'd tend to use Sterling or Euro cash or travellers cheques and some local currency, if I'm able to get it in the UK.
BTC: as much as I can avoid spending :-)