A couple of genuine questions that occur to me whenever these Pi-athons come up: 1: Is there any point to it, outside of a "my computer is bigger than your com

A couple of genuine questions that occur to me whenever these Pi-athons come up: 1: Is there any point to it, outside of a "my computer is bigger than your computer" pissing contest? 2: Given Pi is supposedly completely irregular ad infinitum, are the provided numbers verifiable in any way, without re-calculating it yourself? 3; If not, then can I just take the the latest published figures and add half a dozen random digits of my own on the end, say I've worked out Pi to a trillion-and-six decimal places --and no-one can prove me wrong, without working it out themselves, to a trillion-and-seven?