I would hope you never get a gusher, and would expect that to never happen.
I introduced the 500ml bottle for people to be able to try just one bottle, with out having to part with $18-$20 for a six pack.
Also the 500ml is for supermarkets/outlets that just don't understand that craft beer cost more to make and therefore cost more to sell. I had a friend who was purchasing a six pack, and the checkout person called for a price check because they personally thought there was an error for a six pack of beer to be priced at $19.99
Some times the retailer can be a barrier for beer lovers to get access to the beers they want to buy.