This has been brought up earlier in the thread, but I think from their point-of-view, they make and sell guitar amps. This headphone thing is just a little side venture. Something that their customers might enjoy, a bit of fun. They're not really interested in growth.
Things like better customer service, and an improvement in communication would lead to growth... something neither them (nor most likely Grado) wants.
It doesn't excuse the one phrase email responses, the slowness to ship your order, and the seeming rudeness of the company. Not at all, I just think the only clear message you can send as a consumer is with your wallet. If they don't want to answer you, don't purchase from them. There's other great headphones in the world.
If it effects the bottom line, they should then take a step back and examine whether or not their current methods are working for them or not.