Don't get me wrong, I'm not saying that if band X shows up, then I'm not going. I'm just saying that if the festival starts to repeat itself, then it needs to be more interesting at the top end. I've no doubt that the festival will be the top one around. I guess I'm sorta stating the obvious thing that you are more than aware of Glenn.
If the lineup looks anything like what's been predicted on this thread and you throw a Kamelot, Everygrey or BOP in, then that's fine. However, I feel that if you start repeating in twos and threes, then there will be problems eventually.
There are still bands out there (Pretty Maids, Stratovarius, Running Wild, Rhapsody, Iron Savior, Rage, Sinergy, Children of Bodom, Helloween, etc) that will draw people automatically. Add 1 or 2 of those to any show and you'll have your sellout right there regardless of the rest.