Generally the point is that if you click the link, it will do some additional validation of the site by confirming with the CA that the certificate is the correct one that they issued, but really, it shouldn't matter and could easily be faked by going to some random website that says "yep, they're secure."
It's one of those things that I think was originally intended to be the answer for websites to point out who their certificate is from back before browsers did a better job of properly displaying who the certificate authority is. I think it was mostly trying to counteract attacks where someone compromises the local machine and places a fake root certificate that allows a man in the middle to easily pretend to be the site, though at that point, you are screwed anyway since a keylogger could just as easily be used at that point.
So no, not really any good point anymore and even when there was a point, it was dubious at best. what is a bit different is that sometimes it is more than an identity verification. Some of the services will do vulnerability scans and check privacy policies and such and audit the company and only then allow a logo to be displayed, but that isn't the point of the logos you put in your post.