@david_chisnall based on what info I've been drip fed by my employer's sales team, having a bunch of comments on posts makes it show up in more people's feeds and it starts snowballing from there. If you keep showing up in people's feeds on a semi-regular basis it makes it more likely for them to check your profile out and become a potential customer.

Of course I am neither an enthusiastic LinkedIn user nor a fan of this growth hacking bullshit so this theory may have holes.