Before we even get into the issue of "what is crumb cake , anyway?" I'd like to address why, exactly, I ought to be considered an authority on the subject. In my opinion, of course.
First off, I was born and raised by the Jersey shore.
This is part of what you could consider the "crumb cake belt", extending into New York state to the North and down as far as the mid-Atlantic to the south. To the best of my knowledge, though, the New York metro area and about an hour outside of it is really where crumb cake is a prime time food.