Well, for starters, a band's own show pretty much guarantees that they will be playing to a crowd that, for the most part, is only there to see them. Festival crowds, on the other hand, can often be made up of directionless wanderers, making their way from stage to stage to casually check out whoever happens to be playing their hearts out at that particular moment. Often, if they discover that the band of the moment is not really doing it for them, they will refuse to move, instead staying put and chatting with their nearby friend about everything other than the band the rest of us are trying to watch. Believe me, I have mad many festivals ruined because of this alone.
Usually, as festival set will also not feature a full set from the bands and bands you are their to see, so you're really only getting half the experience in a lot of ways. But anyway, to cut a long rant short, I'll sum wrap up the last couple of paragraphs by simply saying that festivals can, at times, suck a massive one.
Thankfully, there are exceptions, with St Jerome’s Laneway Festival being one of them.
Regardless, a close to perfect cover of Rowland S. Howard's brilliant "Shivers" helps me forget my troubles. It’s a rare band that can pull this song off without making me run for the nearest bucket (I’m looking at you, Screaming Jets *shudder*), but Divine Fits easily pull it off.