>> Cards don't make money from their fees. They make money from people who fail to pay and then pay the ridiculous interest.
> Interchange fees seem to be a sizable portion of revenue. Discover has listed them as 29% of revenue, BoA at ~$10B annually…
My complaint is that pointing at revenue alone does not rebut the initial statement. That's all. The argument was insufficient, not your side of the argument is wrong.