You know what would thrill me as a Theme Forest customer? If designers released “expansion packs” for their themes with new graphics that would replace the ones the theme uses.
For example, I adore the Appland theme, but those graphics might not work for me, and it’s difficult to customize it in a way that doesn’t look like someone else using the same theme. They’ve now expanded it by adding an option to swap out the graphics for some nice leaves.
The thing is, I would be perfectly willing to buy the theme and then pay extra for an “expansion” consisting of graphics that work together and are designed to be slotted directly into the theme.