It has been an eyesore for me for years to be honest and although there might have been (a) good reason(s) for it back in 2010-2011, I don't think it fits in this era.
"HTTPS access is only available to TL Staff. Please use www.teamliquid.net."
You've already got the certificates and the possibility to use https, so why is this blocked for normal users?
Get rid of HTTP and enforce HTTPS. At this moment TL scores a very solid A on SSLLabs, and I'm sure R!CH atleast is very capable of doing this in a quick afternoon.
If not possible, I would be very interested in the reasons why, as I can't think of any.