Yes it is pain in the a**e. Our Year for some stupid reasons decided to sell Easter eggs (the Cadbury one) because it was around Easter. Guess how much it costs? $3/pack. Compare to Feddo and Koala which are only $1 each, it's so much harder to sell. Think about it, when you walk around the playground, those kids are likely to have $1 in their wallet rather than $3, even if they do, they don't really want to spend it on easter eggs.
The worst is we had to sell it all, the school told us the factory will not accept unsold easter eggs due to it is seasonal products unlike other normal chocolate.