The sign that a particular cryptocurrency (or rather crypto-ecosystem) will be successful is if there's a genuine use case.
Well for Steem there are several.
But a particular one I was made aware of recently:
Tips for Camgirls.
Consider this typical exchange:
Camgirl: "I'll show you [body part] for two tips"
Man: "Oh bby can you do it for 1 tip? Also show this [body part] and do a verification picture.
Say hi [man's name]"
Camgirl: "No! Two tips and [body part]"
Man: "I luv you so much bby. So hot, so spicy. Oh bby. I just need this one pic, and I can't afford two tips.
Pls. Just give me this one kindness bby. Just this [body part]"
Camgirl: "Ok! But pay one tip after. Deal?"
Man: "I promise bby. This act of kindness will never be forgotten :) "
Camgirl complies
Man: [exits chatroom]
Camgirl: FML not again...
Now, it costs nothing for the man to upvote the Camgirl, but the click of a button (which he was doing anyways while navigating the site).
The result is that both the Camgirl and the man are pleased, and walk away from the exchange satisfied.
downvoted for your username..