They are. Check out whois.com
It is a little underhand and reflects a lack of professionalism but I don't think it is terribly bad of them.
Interesting, I didn't even know about this. It's just a marketing tactic. I agree it's not terribly bad, and I personally don't see anything particularly shady, underhanded, or unprofessional about it. Someone looking for Gox and mistyping the URL would learn about us too - no biggie.