@ cats squirrel
"Has any person (who lives on this planet) says its necessary?"
No... just experimentation sunday... I'm sure however that someone I read about an owner who filled the hub with white decorators caulk. I thought of that as well, but couldn't think of a way to get it nice and smooth / level.
Also, I have definately seen a piccie on a forum of the inner platter filled with cork. Now to my mind, that cannot be as good as wax - it's density is far lower.
Let's put it this way. Why would you design an inner platter that sung like a bell and is hollow, apart from manufacturing and cost reasons. You wouldn't.
I'm still tempted and indeed as I might be the first on the planet to do so, could even be a trend setter !