Are my following thoughts on bitcoins correct?
No.
- Everyone is trying to con everyone?
No.
- Difficult to buy?
No.
- Difficult to sell?
No.
- Bad time to get in unless looking at the long-term?
No.
- Value has gone from $70 to $90 today?
No. So far, the exchange rate has gone from $80 to $96 today. (at least in my timezone)
Edit: Bonus question: Why has the value increased so rapidly over the past day?
It is growing in popularity and recognition. The availability is limited. An increasing number of people bidding on something of limited availability tends to drive up the price as more people are willing to pay more for what they want.