I had one domain briefly hosted on one Dreamhost account (a transfer from 1&1), and then I decided I wanted to host it on a new Dreamhost account.
So I killed the domain from Dreamhost account A then tried to add it for Dreamhost Account B, but got this error:
Can't add domain: Promotional and referral accounts are for new customers only. This domain was previously in our system and cannot be added to your promo or referred account. If you would like to upgrade to a full price plan, please contact support..