Literally every hobby has an incentive to target those practitioners who heavily spend and spend time with other similar minded practitioners.
> Cooking
And you see the rise of influencer and performance driven marketing by firms like Henckels and Le Crueset (nothing wrong with that) along with those who truly love cooking specific types of cuisine overindexing on unique or subsets of ingredients (Geographic Indicator or bust)
> watching movies cheap (not to mention piratable)
And you see plenty of movie enthusiasts optimizing for 4K displays, high fidelity sound, or falling deep into IP-driven subcultures like Disney-fanatics
> coding is cheap
And you see whales who spend inordinate amounts on money on mechanical keyboards, 4K monitors, personal rigs, etc
> playing 8-bit games is cheap
Retro gamers.
> book club is cheap
Book subscriptions and local bookstore-led book clubs
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Show me the hobby, and I will show you the whales that all businesses in that specific hobby will target.