Re: Why would anyone want one or invest in such a thing?
For the same reason they buy books called 'What men know about xxxx' that are completely blank.
It's - at least for the person buying it - humorous and ironic and many of them think it will make a good Christmas present. (They're wrong, but that's beside the point.)
Of course, this could have been offered as a 3D printed gimmick on one of the standard websites but putting something silly on Kickstarter tends to get you a bit more press and thus more success.