Not just Janelle. I had a look back at the clashfinder and I'm not sure anyone else on at the same time across all the stages was enough of a draw to get people - particularly the demographic with nostalgia for Avril Lavigne.
Not saying the opposite, but festival fans tend to be very conservative line up wise. We/they always demand the same bands. You book all this bands to please such core cohort and wait they release music up to their status.