Very niche for sure. But it's like the rest of the publishing industry. They have something you need and are the only ones that have it, so they can charge anything they want.
If $500 for a copy on an iso about home network security is true (as another commenter pointed out), I'm sure they charge similar if not more for the popular ones companies rely on.
If $500 for a copy on an iso about home network security is true (as another commenter pointed out), I'm sure they charge similar if not more for the popular ones companies rely on.