I struggle paying money for extra space when I can just get a cheap 2TB hard drive as central storage and flip things out when I want/need.
I have a gaming rig with 700GBs of SSD, a MBP with 512GB SSD, the 16GB iPhone 5S, and will get a 16GB iPad Air.
And I have four TBs of local storage - some on an FTP - so getting files, music, etc isn't hard. Furthermore, what do I even need to store stuff for?
Pictures, yes - but I can put them on Flickr. For movies I use Hulu/Netflix/Amazon. For music I use Spotify. Documents are stored in the cloud. I just don't really see the point of 64GB tablets and/or phones except in unique circumstances or you REALLY like to play mobile games.