No catch, except you can’t pay using PayPal if using a promo code.
The promo code discount only applies to your first payment. If (when) you renew your hosting, you will have to pay the full plan cost.
Pay just [color=#CC0000]$22.40[/color] for 1 year Dreamhost hosting, use promo-code [color=#CC0000]MOJO97[/color]
Save [color=#CC0000]$97[/color] on all 1 and 2 year plans!! (Max saving on monthly plans too!!)