According to Peter Drucker the purpose of companies is to create customers. Without customers companies seek to exist. Breweries that don't sell their beer go out of business. Authors who don't sell books go out of business.
Breweries may be started by people who love what they do, but if they don't sell beer and turn a profit they will close down, that's as true for a macro as it is for a micro.
The micro brewer may not have the constraints of a finance department or a shareholder hovering but they will have the constaints of a bank loan so they do need to brew and sell commercially viable quantities of beer of an acceptable quality. To imagine that the head brewer at a macro is less concerned / excited / motivated by their work than their micro counterpart is making large assumptions.