Many, many people buy them. I never have. I prefer to edit based on my own artistic vision.
There are 2 versions of Photoshop that can run actions Elements and CS 6.
Elements is a consumer version and it lacks many of the tools, features, and functions CS 6 has.
The last time I checked, Elements cannot record actions even though it can play them back.
Are you familiar with the image editing issues related to "bit depth"?
Bit Depth
If an action you buy uses tools, features, or functions that are only in CS 6, that action will only work in part in Elements and you wouldn't get the full effect of the action.
Chapter 13 -Automating Photoshop - of this book covers actions and would be an essential reference book to have at hand if you get CS 6 and want to learn the details of using CS 6 -
Adobe Photoshop CS6 for Photographers: A professional image editor's guide to the creative use of Photoshop for the Macintosh and PC