You need to take 10 minutes out of your day to remove the plastic enclosure. Depending on your setup, you may also need to make some minor modifications to the drive: google.com/search?q=3.3V+wd+easystore
The theory is that this is a form of market segmentation, where enthusiasts/companies are willing to pay more for a bare drive regular consumers.
I picked up 32TB for just under $500 with discount over the holiday that way.