Selling only inside the venue surely keeps most litter, glasses, beakers etc largely contained. Selling more widely might mean people expect somewhere to sit with their drinks (and Blackmore Gardens is pretty full now!) If the trade was brisk it might upset the pubs who sponsor the festival - but by how much in relation to their trade? You'd also surely increase the litter clearing problem within the Gardens. And some families may welcome the 'alcohol free' ambience.

Soft drinks sales might conflict with the lemonade sellers too? They have to pay a tidy sum for their pitch?