Well if you find a sandwich company, you should let them know.

But Mattel, Sony, GM, Apple, and American Airlines aren't signing up anytime soon. That's the problem for Tumblr.

I think this is just one of those instances in which a customer just starts costing you too much money. Will banning the low-rent crowd make a difference at this point? Who can say really. But keeping them pretty much ensures you will not get access to the deep pocketed advertisers.