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> Credit card companies make a decent amount of their money from the interchange fees, but the majority of their income comes from interest, cash advance fees, and penalty fees, all of which the well-off credit card user paying off their balance each month does not contribute to.

Those customers are called Deadbeats[1]. All credit card customers should strive to be Deadbeats.

[1] https://www.investopedia.com/terms/d/deadbeat.asp

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In my mind, this implies that the vast majority of customers are not deadbeats - meaning they never pay off their cards in full and always have interest?

My understanding is that 25-30% of all credit card customers are deadbeats. I've worked with some fintech companies and that number came up in some discussions. I cannot, however, find a corroborating source.

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