You joke, but a lot of savvy people hoard $100k with BoA through their brokerage in the form of ETFs specifically for the bonuses to credit card rates (and the free equity trades).
Yeah, I know. I'll probably roll over my 401k into an IRA at Merrill Edge for the free trades and 75% perk on their cash back cards.
I was just highlighting the horrible rates that banks currently provide in the customer's favor even if you are a loyal patron holding a substantial (for the vast majority of people) sum of money.