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MTB hubs are noisy as hell anyway, and yes, the more expensive the MTB the noisier the hub. For pedal bikes it's about being able to pedal without doing a full rotation and not losing power or wasting energy

> Sales person claimed (falsely) that the more pro the hub the louder.

What's false about it? Pros tend to ride wheels with loud hubs. It's kind of a known thing.

Even loud hubs are more silent than most motorbikes.

It's kind of true. If you want the hub to engage right away when you pedal, you'll need the rachet mechanism to have more points of potential contact and those points will all make clicking sounds when you're coasting.