You have a very good observation points

when i learning customer insight, i remember that in this module, tutor mentioned that group influence.

Marketers can by observing the type of consumer, or take the initiative to create a platform that belongs to a class of consumers. Maybe similar to that you said community.

By observing this kind of customer, provide special demand for this kind of consumers, thereby expanding the marketing effect. Maybe is word-of-mouth.

Thus, i think you catching a good idea.