You’re working things out on a far bigger scale then these breweries work at, for the guest beers they be lucky to hit double figures never mind 1000!
Aye your probably right on the numbers but even then on a smaller scale it would have the same impact though, the cost price would be just higher instead since it wouldn't be £120 anymore. The fixed costs probably wouldn't be £20k either tbh was just an example though.
When you try to sell it sounds better to say we're stocked by Wetherspoons to someone rather than we're stocked by the local boozer in Penshaw. Quite a big coup. It's the same with supermarkets who are similar. It sounds much better to say we're stocked by Tesco than only stocked by Barry's Bargains.