Isn't Steem supposed to stay near $1 instead of rising to high values like $100?
According to the FAQ:

Will 1 Steem Dollar always be worth $1.00 USD?

The market value of a Steem Dollar is dictated by the supply and demand of the token. Therefore it is possible for 1 SBD to be worth more or less than 1 USD depending on market conditions. However, the network's SBD conversion feature serves as a mechanism to hold Steem Dollars within a small margin of the value of USD.