The fallacy comes from forgetting these are people. “Surely theres 1 in 10,000 who want this” is wishful thinking, “There exists a type of person who wants this, and I can point to them, but they happen to be a small segment of the population - 1 in 10,000” is actionable and valid.

There’s nearly 8,000,000,000 humans, so there’s a ton of variety that one can’t even imagine, but probably none of them want to eat a bar of soap for breakfast each day even if you think there must be some rare 1 in 1,000,000 out there.

Putting 1 in BIG NUMBER is just a way we abstract away hard and intimidating questions.