Because is one or rare coins that will stay after big crypto cataclysm or a Cryptogeddom.  

Why?

Because Monero have real world use. Its nontransparent ledger helps you with keep private your financial datas with partners you are working with in everydays life. When you go to store buy a bread or in bar buying a drink. Bar Waiter cant see how much money you have and where you get it from. And that is only right thing.