Maybe because most professionals think the costs outweigh the benefits, and because there are no suitable alternatives?
LinkedIn's value also seems to become dearer the higher up you go in organizational hierarchies. And their canny strategies to hook more of the C-suite (e.g. 'Influencer Posts') seem to be working quite well. I see superbly shitty posts like Vivek Wadhwa's "Facebook is Doomed" (https://news.ycombinator.com/item?id=6424292) doing great on the 'LinkedIn Today' home page for days [Edit: Just checked. It's been on my home page for 4 days now!]. Thus proving that the mediocrity (which tends to be rise to the top in large organizations) is truly flourishing at the top of LinkedIn's food chain :)
LinkedIn's value also seems to become dearer the higher up you go in organizational hierarchies. And their canny strategies to hook more of the C-suite (e.g. 'Influencer Posts') seem to be working quite well. I see superbly shitty posts like Vivek Wadhwa's "Facebook is Doomed" (https://news.ycombinator.com/item?id=6424292) doing great on the 'LinkedIn Today' home page for days [Edit: Just checked. It's been on my home page for 4 days now!]. Thus proving that the mediocrity (which tends to be rise to the top in large organizations) is truly flourishing at the top of LinkedIn's food chain :)