In reply to:
That would explain the number for the referrer... because I doubt many would want their email addresses in their referral links.
Or the email address in the rewards page for the referrer to see.
On another note to do with this topic, what sort of company tests their new sign-up page online, at the moment as far as I can tell promo codes work (created a test account) as the discount is shown during the sign-up, but the referrer does not see any id or referrer number or email address, in their rewards page, previous to the new sign-up page you would see the web id in the list, now nothing is shown.
I tend to think there is a transition from the old to the new system, but for a professional company this transition should only occur once after extensive testing, in the past few hours I've seen the rewards page change from the old version to a new version 2 or 3 times, this strikes me as very unprofessional, it is obvious Dreamhost do very little testing of new code before rolling it out, after which they find bugs and then swap the old code back in while they make some fixes.