For a buy and hold investor, is it worth it to switch from Fidelity to Merrill?

Asking this as their preferred rewards program seems interesting in that you get a 75% boost to all credit card cash back if you keep $100,000 in Merrill which is hard to beat.

I like Fidelity a lot, but for a Boglehead like myself who just plans to buy and hold ETFs is it worth switching to Merrill?