My thoughts..
For one, no promoter is going to make everyone happy. I'd LOVE to see a band like Khallilce or Pictorial Wand play this festival, but few have heard of them. All 1200 attendees can make a list of 25 bands they'd like to see that nobody else has ever heard of. For that reason, Glenn (rightly) tries to hedge his bets: some prog metal for the die hard Dream Theater fan, some power metal for the Kai Hansen worshiper, a melodic rock band or two and even an "oddball" fan for the death metal/growling lovers out there. While the trip to Atlanta is quite pricey each year, it's the number one thing many of us look forward to each year even though not every band on the lineup makes us jump up and pump our fists. Hell, we all get excited TEN months in advance when the opener is announced. Raintime, who the hell is Raintime? At least that was my initial reaction. Then I heard their debut. Needless to say I'll be going NUTS during Moot-Lie.
After you take into account the "pleasing the masses factor" (and the fact that Glenn has to like the band himself), you have the expense factor. One band that nobody mentions is Vanishing Point. Prog fans love them, power metal fans like them, and I haven't heard anybody say anything negative regarding their last masterpiece. However, they'll probably never play this festival. As mentioned by Glenn, the sheer cost of getting five band members, equipment, etc. from Australia would trump what any sponsor is willing/able to front. Same can be said for other bands. I doubt you see Concerto Moon play this festival anytime in the future. It's a shame, but I suppose it's the way it has to be.
Finally, you have the list of bands that can't seem to keep from cancelling shows. While I don't like Nevermore, they're clearly at the top of this list. Royal Hunt has a problem fulfilling scheduled dates, as does Nightwish. It's a shame, as I think a band like Royal Hunt is perfect for this festival and a US date is long overdue.
I totally understand the philosophy of "making someone into a headliner." While I enjoy Pagan's Mind, I'm not as much of a fan as others on this board. Similarly, I like Primal Fear, but I do think they're the second coming of Judas Priest (which isn't a bad thing per se)...they're just not a band I'm dying to see live. I'll watch their entire set. I'll go nuts during Angel in Black. I'll enjoy a number of other songs. In the end, however, there are bands I'd much prefer to see. Again, to each his own. The way I look at it is this: If he's "taking a chance" by making Pagan's Mind a 4-spot this year, maybe he'll do the same thing next year with Eternity X (reunion factor), Labyrinth (Return to Heaven Denied factor), or a Michael Kiske/Andre Matos solo set, all things I'd pay big money to see.
Lastly, there are still bands that have NOT played this festival that could/should headline: Helloween, Ayreon, Rhapsody, Within Temptation, Fates Warning, and Shadow Gallery are the first half-dozen that come to mind. There are others I'm sure. If one of those bands played, you'd have a sell out the day the tickets go on sale. Sure, not all are "feasible" (see Shadow Gallery), but you understand my point. There are still big drawing bands out there.
Nonetheless, due to a 2-spot band getting a solid hour, essentially there is little difference b/w a 2 and a 4. Thus, while I would like to see Virgin Steele close out Saturday night, I'll take the hour with a smile. Similarly, if I had the opportunity to see a band like Cloudscape, Machinae Supremacy, Tomorrow's Eve, or Poverty's No Crime get an hour of stage time in the US as a "2-spot", I'd be so happy that I'd consider sponsership. In essence, I'm saying that the order of the bands doesn't matter all that much, it's the excitement of seeing some bands play that otherwise would NEVER EVER tour, nevermind play a one-off show in the US. Essentially at the end of the day, the 4-spot band is playing two extra songs. Thus, the headliners themselves have never been a "make or break" factor in determining my attendance at this festival. For example, seeing Vision Divine for an hour last year was worth the entire trip, even though I'm not the biggest fan in the world of Jorn or his choice of setlist last year.
Everyone has a right to complain. I've made posts on this board that have been deleted (expressing a negative opinion) and I think that's a shame, but I don't run this joint. When the smoke clears, I'll be there each year with Gold Badge in hand, waiting to shop, hang out, and bang my head. You're guaranteed AT LEAST a handful of bands each year that you're going to love. Hell, you may not love all of them going into the fest, but might leave the show becoming a gigantic fan. Whoever thought I'd enjoy Freak Kitchen? Not I.
Hey at the very least, it beats work/school/the monotony of life in America.