[sas41]

I think sites/pages like this hold an important role, presenting information to people who have trouble visualizing concepts or need visual aid to better assimilate information is important and sometimes, a simple 2D rendering or a dry graph just isn't enough.

And if you need a 3d graph, you're only a handful of lines away from smoothing out your presentation, so why not?

There's also the more subjective aspect, I think adding the effort to make something look nice and slick, animated well, could be both an interesting challenge and a relaxing pass-time. It's pleasing both to make and digest, in a way, it sits in an intersection of design, art and technique and as an added bonus, could help capture the attention of someone who struggles with short attention spans even better!