One thing you need to consider when making an actual "prediction" vs. a "a forum popularity list" is that I catered specifically to this forum last year in terms of wants/predictions and did not sell-out for the first time in four years. That's not an experience I care to repeat.
Yeah, but weren't all your big "buzz" bands in the lower slots(Freak Kitchen, Pyramaze, Vision Divine)?
Seems to me that your headliners were fairly mainstream choices, I'm just not sure they appealed to the prog or power metal customers. Evergrey is prog, but Nevermore, Epica, Mercenary, and Jorn are not really prog or power. All are oddballs of a sort(Jorn is more melodic Rainbow-style classic metal). I would think that putting them all together in one lineup would bring in a different audience from previous Progpowers.
And to be honest, I read this forums pretty thoroughly and never really saw that much buzz for Evergrey to headline again. Or for Mercenary to play in a slot that high(most people would have liked them 3rd). Same with Epica, who had buzz, but not in such a high slot. Nevermore I didn't see much buzz for either.
No big power band + no big prog band = no sold out Progpower.