I think the question: What are the underlying reasons bitcoin is expanding?
I think the following reasons are possibly pushing the value:
- Bitcoin is exposed in the media. There are more people buying bitcoins.
- Economies around the world are falling apart. People search a new safe haven.
- People invested in bitcoins through mining rigs. These people are holding their bitcoins, creating scarcity.
- Because of the hype people keep buying bitcoins, pushing the price.
The first two reasons would be good, if bitcoins can be used at more places. The economy of bitcoin is growing and if people can actually use them for payments then there is less reason to sell them. They won't mass sell the bitcoins, because with a bitcoin you can actually buy something. (Besides drugs)
Bitcoins can also be used as local currency. Then people won't start selling them either.
The last two reasons means people do not want to sell the bitcoins yet. That would be bad, because if they sell, they would do it en mass.
It is quite exciting. I kept some and sold some, so I can bet on two horses. That seemed the most sane.
I actually don't believe the normal person would jump in now. So it seems the bad reasons are more probable.
Is it known, how much bitcoins are in play and how much are actually moving? That would be interesting.