If you take one look at the Siouxsie & the Banshees the quick reaction is to view them as a Goth Band. Looks are certainly deceiving in this case, and though that does describe their look and a component of their music that is hardly all that they were.
After we came up with our rankings, it just seemed right for the Cure to be associated with number thirteen (their original rank). The mystical number might fit the gothic image of a band (who ironically despised that label) better than any other group on this list.