A couple of genuine questions for you, not to lessen the good fortune advertising has brought you.
Did you go to eat at Taco Bell because of the ad? Would you have already, and perhaps seen it on their menu boards and tried it as a result?
Were you really not aware of these other taco places, and only became aware of them due to billboards? I know of 2/3 of them, I haven't heard of Taco Time (live in the midwest), but I've heard of the rest from people I know. I don't think I've seen any of them advertised here, but I could be wrong.