Hi JSLevine,

Themes doesn't contain the images that we use on our previews because those images are copyrighted and theme authors can't re-distribute them to their clients.

Even that authors are allowed to include those images on their theme we can't do that because if we include original images a lot of clients will need very powerful server and their limits must be very high to be able to import all the original images.

We actually wrote about this on our item page:

Image Credits:

The sample images viewed in the live preview are for demo purposes only and are not included with your purchase. They’re replaced with sample images so you can easily replace the images with yours.

Screenshoot:

(view on new page)

This is not only our policy, but this is not allowed by Envato too and all the theme authors use sample images on demo-contents so users will have it easier to change with their images and content.

Hope that i gave you a nice explanation.