Everyone is there for the same reason, Heavy Metal!
Then why isn't there any being booked?
Ok, I know that's not what you mean, but you've completely missed the point - its not that other metal is being booked, its that it's being booked largely at the expense of what the festival was known for. I'd definitely not listen to metal I disliked, if I thought for a second I could get away from it. Much harder these days. Like I said, there are other places to see Devildriver, but nowhere else (in the UK) that would book an Emperor headline show, or Death and Dark Angel's first festival here in years. Bloodstock are still doing that (not as much in my eyes), but there's no final Falconer UK show, no Evergrey who have just released their best album in years, no Powerwolf, no Helloween, no Blind Guardian. I'm much more into my power or prog metal than anything else, yet the bands I'm mostly looking forward to this year are pretty much all black metal bands. They are letting other things slip away chasing a more mainstream crowd that already have plenty of places to go.
The easy answer would be:
- Blind Guardian's only UK show still hasn't sold out even after tickets being on sale for a year
- From accounts on here (not completely reliable I know) Avantasia didn't have a massive crowd (and they're both a rarity and one of the bigger power metal bands)
- How much press/talk do you hear about those bands outside of your niche? I don't like say, Ensiferium or Korn but I know who they are and a small idea of what they're doing; I can't remember the last time outside these forums that I've seen or heard a mention of Evergrey
Either BOA has decided it's outgrown it's past or decided it's past audience alone isn't enough to sustain itself.
I'm neither defending or attacking BOA here, (if I was to do anything it would be a cautious defending as BOA is moving into a perfect sphere for my tastes though they could easily outgrow that) just saying what I see.