> as long as you were mindful about using the discover card for qualifying purchases and the 2% card for everything else.

And that's the rub. Credit card companies know most people won't be too mindful most of the time about their spending habits.

There is one other rub - because I use my bank's card I get better interest rates. How does a .25-.5 % on my various loans and checking account compare to 2% on groceries - this is a complex question that it not easy to answer.