I'm a bit late here, but better late than never! Bitcoin is a network, and therefore a lot of its value comes from its user base. Being the most valuable gives it the most attention, which gives it a big user base (at least as far as people who have heard of it).

That's also one of the biggest bull arguments for STEEM - it has the biggest active user base of any blockchain or cryptocurrency and by those metrics it is quite undervalued. The site https://blocktivity.info shows this well.

In any case, welcome to Steem - great to have you on board!