Using Tapatalk, I saved the first QR Code above ro my iPhone's photo-roll, and then opened my QR Code Scanner app and imported it. It worked!
Except that it was much less convenient then just clicking a link.
Keith, what I suspect is that they are using a trackable URL (like the goo.gl one I mentioned above) and end up with a hard-to-type or a hard-to-remember URL, so they QR Code it for mobile users. On the other hand, if I'm already on a computer reading you page, a simple link works just fine! Unless it's for a special mobile only resource like an app or SMS message or something.
Finally, I suspect there is still a "cool" factor that has marketing departments overusing QR Codes for nebulous reasons.
One excellent use of a QR Code, in my opinion, is for business cards. Having one on the back that leads to your website and doesn't require the recipient to gave to enter it is a feature. Also, I don't know how many people realize this, but other content can be encoded, not just URL's. You can initiate a telephone call, or an SMS message, or an email, or just encode a small snippet of text, like a name, password, or home address. They're much more versatile than many realize!