I am rather fond of it. Some my see it the same as flat Earth, and so probably do not differentiate between the two, since both are just some crazy talk in their opinion. For me, hollow Earth always felt natural and possible, even the proposed scientific models on how it could be, seem solid to me, when at the other hand, I always found flat Earth movement to be just ridiculous. Not wanting to veer out of topic though. but yes, I think I would peg myself as a sort of a fan of this one.
After all, there are many caves and caverns to be found below the ground we walk on, so technically it already is hollow to some extent =)
There is a video on youtube, which shows water behaviour in vacoom or probably zero g when spinning around, and when some other material added to it. It almost shows how hollow earth could have formed.
https://www.youtube.com/watch?v=JeMzOhoJpfw