Honestly, it isn’t too hard to add HTTPS support to your website. Plus, it’s proven to be faster and obviously more secure than normal HTTP. Also, due to Chrome’s pushing of secure websites, the login boxes on the forum now say “Login Not Secure”, which I suppose could scare users away.
With the upcoming Tower Unite website, I will be ensuring that it runs with HTTPS.
As the forums are concerned, it is a future plan of mine to add HTTPS as well, but the situation is a bit more tricky, especially with the amount of broken / incomplete secure connections that would occur due to the number of off-website images linked.