The max cash that can be given is $50 off - which I believe can be used for 1yr or longer commitments (maybe 6months too not sure).
The other deals that can be given are lifelong and can amount to a lot in the long run.
eg say you're going to register 3 new domains - every year that's going to cost say $30... over 10 years that's $300, but with one of these codes, you can get all 3 free every year for as long as you stay with dream host.
Similarly you can get codes for static ip address, or similar.
We cannot create a code for say $50 off every year, just a one off $50 off.
Of course if you're just going to need just one domain registration and nothing else then the extra stuff is probably of no interest anyway, unless you happen to join during a time when Dreamhost itself is running a promo (check the main account registration area www.dreamhost.com).
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