"I mean that sincerely"
That phrase (in a comment) could only be used by a goat-getter. Why would I think he doesn't mean it sincerely? If I visited a blog and liked the content, I would say, "This is great." The end. Why would I add a disclaimer thinking my comment might not be thought of sincerely? The commenter knows his intent and is trying to counteract what he expects to be the reaction. He wants me to publish his comment and in a response be flattered, and that is how he would get his inside laugh. But, the phrase is a dead giveaway. I smell a prankster... wearing the de rigueur "anonymous" costume.
Some people play with friends, some people play with toys and dolls, and some people get their kicks from visiting my blog and trying to get my goat! It's all good. Whatever floats your boat.