Re: Not surprising
Much of this is going into what are called ICOs AIUI. The big transactions are not cash, the small ones are. Thus most volume is for inter-crypto currency conversions. This is why the transaction goes through even when fiat exchanges are down.
I think money laundering also plays a huge role. I do think this is a bubble but then I also think fiat currency and QE are bubbles too so I don't know enough to draw the line.
If it ever becomes a real economic currency it will absolutely skyrocket but then regulators will stop it and it will die. I can't see how crypto currency can help society anyway.