[likpok]

Your link sort of hints at the reason, I think. There's enough posted to make a serious run at replicating it, and it seems to be simple enough that you can do it in a kitchen. At the same time, it's not so easy that people have cleanly demonstrated it -- the constant rollercoaster of "we're so back" and "it's so over" I think drives some of the hype.

It also seems like it has at least pretty strong diamagnetism, which while not a demonstration of superconductivity is both somewhat interesting and gives a vivid demonstration that's amenable to social media.