I wasn't speaking specifically about the F_BO sites, as the powers that be (google at the forefront) are pushing for every site being a secure site.
Here's a quote from Google as to why.
"Websites with a "HTTPS" added before the URL indicate an added level of security to normal web browsing, compared to visiting a non-secure "HTTP" connection. This guarantees users are reaching the website they intend to visit, and the extra security protects them against hackers.
"When you load a website over HTTP, someone else on the network can look at or modify the site before it gets to you."