He's not great, that's true. Scarra and QTPie have been doing this full-time as professional gamers for three years now, though, and never even scratched the surface of being top-tier international players. There's a reason Saint and Hotshot bowed out once they realized they weren't even keeping on top of the NA competition.
I guess maybe Scarra's waiting for Reginald to call it quits before he finally hangs it up. I like him, he's a great guy and he has fantastic all-around knowledge of the game, but even with most of this season played on patches very well-suited to his champion pool, he couldn't cut it. He might get one last gasp of greatness off while Gragasmania is in full-effect, but I honestly think he'd be better off becoming a team coach or even a shoutcaster at this point. (As long as he doesn't wear his cowboy hat while casting.)
And QTPie... eh. There's a valid defense to be made for Scarra in that the pool of highly-talented North American mid laners is pretty shallow, but we've never been hurting for hot shot ADCs. Hell, we've tried to turn half of them into mid or top laners just because we didn't have enough teams for all of them. There's no reason I can think of that he shouldn't at least be having to compete for his job along with KiwiKid, and I seriously doubt he'd win it if he had to.