In what exchange I can buy ebtc?
This is what I believe too.
I think even without a pump, eBTC's value will naturally grow with time. 
This is what I believe too.
You can buy on HitBTC, EtherDelta, or on Stocks.Exchange. Most of the volume goes through HitBTC.
It's worth only if you trade a decent amount, transaction cost is pretty high for low volume trading.