Simple, because it's new, and it kinda makes you rich much easier and quicker. Everyone wants to adopt it in an early basis.
This is true, because of the volatility of Bitcoin. Lots of people are now getting into Bitcoin world. Aside from it is easy to earn money, it is also very useful in terms of payment settlements such as electric bill, water bills and other online payments. That's why Bitcoin demand is getting higher.
BITCOIN sucks dick to do payments though with the apeshit fees unless you happen to use the segwit wallets