Speaking personally, the activity you're describing sounds like a major time sink, and doesn't align with the LinkedIn experience of anyone I know.
It shouldn't fall on the shoulders of a social network's users to learn how to optimize their representation on that one website.
To your credit, maybe you're getting contacted by well-off companies because they admire the effort and techniques you're using to boost your profile. If so, having everyone pour the same kind of effort into it would arguably help no one stand out, and only "add value" to the platform itself.