Because we can. And because nobody can be REALLY sure what will, or will not, happen when the Mayan Calendar ends.

But no matter what happens, we will be all working together in a global magickal working that can only be performed every
25,800 YEARS!

Not only will this be a once in a lifetime event, it most likely be a once in
civilization's lifetime event. Indeed, the next time this happens, humans may not even exist!