Yeah when I started looking at one of my local credit unions I almost jumped at the 10% interest rate before I realized it was only 10% on the first $1k then less than 1% on everything after that
I hear this argument a lot, but is a checking account really the best place to invest your money? In my view it's better to get 10% on $1k than 0.1% on unlimited, and then take anything over that $1k (or whatever you need in your checking account) and put it in a real investment.
Remember we're talking about checking accounts, not mutual funds. It's not a real investment. You might as well get something even if it's small.