For any investment, speculation, or reason in anything… All you need is one reason. 
Subtractive innovation
True innovations; subtracting things, making things simpler?
For example, getting rid of counterpart, counterpart risk, as well as subtracting the middleman?
Getting rid of the trusted third-party.
Honesty?
.
Electronic transactions, which do not require “trust”
.
Peer to peer is the future?
Decentralized peer to peer?