As a curious beginner intrigued by the cheap price tag, what can I do with the extra PSD files, besides opening them and having a closer look at on Photoshop?
That's pretty much it. You can see how I organize my Photoshop file, what kind of effects I use, and maybe copy some styles or textures for your own designs… I know most people won't have a use for the PSD, that's why there's a cheaper price point as well.