That's an unfair advantage, they'll be used to the controls and characters before the rest of us
Yep, welcome to life.
You'll really see the difference at evo as people like daigo and inflation have played for thousands of hours as they get special access to the game.
Got a hankering for some fighting, which SF is worth getting on Steam: SF X Tekken, SFIV or Ultra SF IV? I'm not a Street Fighter snob nor all that good at it, just fancy a brawler. Skullgirls recently wet my appetite for 2D action. Man I wish there was a new, hand drawn 2D SF game
Why would they have a demo?
The same reason most other console games have a demo
I don't think it's a particularly difficult question to answer?