>in particular the highest income consumers get the worst returns on their interchange payments
That's not what the article says:
>High-income consumers with high FICO scores benefit the most from reward credit cards compared to mid- and low-income consumers with high FICO scores. At the lower end of the FICO distribution, however, this pattern is reversed. On average, net rewards are far more negative for high-income consumers with low FICO scores than for middle- and low-income consumers with low FICO scores.
>Or, to put that another way: if there is redistribution happening, it necessarily includes redistribution from unsophisticated high income customers to sophisticated low income customers.
While it's true that wealth customers with low FICO scores are getting hosed, it's not clear whether that is enough to cancel out the effect that richer people (presumably) have higher FICO scores on average