It isn't just the solitary Homebrewer who can experience the joy of brewing. All the pub regulars can open up their own micro-brewery and elect their master brewer from their number, who will then take responsibility for the next decoction. There can hardly be a way of tasting beer that will be more fun, or elicit greater discussion, than sampling self-brewed beer. Sooner or later every active professional life ends in retirement. They soon start to seek a replacement.
Brewing can fill the vacuum.
Homebrewers get more out of life.