To be ahead of the technology curve.
Yeah, I was too young to appreciate the very early WWW, however I remember using in in the mid-90s. Now with Bitcoin, despite only reading up on it around this time last year, I feel privileged to see it all panning out.
To think that it has been around for over five years now is something that I find remarkable.
Curiosity! And also for Money. 
Haha, I'd say a large proportion of Bitcoin users have a common reason
