I personally just use Bitcoin for the possibility to earn money thru it. I just cannot use Bitcoin as a means of payment because here in my country Bitcoin is almost nonexistent, only a very few people know or have any idea of it. I would love to transact one day using it perhaps for online banking when I have plenty of Cryptocurrency already.
Bitcoin volatility is its biggest strenght and one of the main and best reason why we use bitcoin is because of the unstable value we need to accept the fact of one day there is a possibility of bitcoin price will be permanent. I think it is good also because many people will not take risk to sell their bitcoin yo get a high income or high value.