You seem to ask three different things here : - what happens when everyone tries to cash out? -> a crash. Bitcoin value will drop very fast. - where is all t

You seem to ask three different things here : - what happens when everyone tries to cash out? -> a crash. Bitcoin value will drop very fast. - where is all that money coming from? -> it's coming from people buying exchanging Bitcoin against other currencies. - not sure why you cite all those thefts. Are you trying to ask why there are such huge thefts? Bitcoin is still young and companies don't have strong regulations like banks, so they might be less secure. This will be better with time.