Zappos Anecdote: I reported a bug with handling of email addresses with a '+' in them (ended up in a URL in the email still as a plus instead of URL encoded). I gave a technical description of the issue. I got a prompt response, a notification that it was fixed, and my account was bumped up to some sort of 'premium' status (which I can't use because I'm no longer living in the US, but that's not their fault).