Why?
Is that because it's has 'Scarcity'? People will pay more for it in the future?
If that case is so soundly put why would you not buy as much btc as possible?
Playing a bit of devils advocate here but wouldn't you say that it's volitility leads to more trading?
Means of exchange need to be further defined in this crazy overfinancialized world we live in. total trading volume of BTC is absolutely insane.