On: A barber shop on wheels that you book via an app

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>2) You may rely on the local business in some situations (urgently need something), but it can't survive on this type of custom alone.

This means paying premium everytime for a feature you "may rely on ... in some situations".

[TylerE → NullPrefix]

Depends. Develop a good relationship with the proprietor and you'll often find yourself paying less than the price tag, especially on expensive, relatively high-margin items like musical instruments. Sometimes even less than online prices.