Not sure if Ozzfest would be good for CoB in all aspects... Wider audience yes, but what kind of audience? America has good loyal metal fans but has many trendcore kids, too. But we have them everyhwere.
I really wanna see what bands end up playing at Download this year. I'm convinced that there'll be noone there that'd make me really want to go except Bodom, if the rumour is true.
Alexi once said in an interview that the most important for a metal band is playing live and that he doesn't care if their songs aren't played on the radio or whatever
So I'd say they'd play for free.
(The interview was part of a documentary about Wacken 2006,if someone wants to know.)