Like they will randomly deposit a pokemon into your bank as an event gift with a little message saying "Thank you for choosing to use Pokebank, please accept this gift."
I can see that happening for some reason.
While it would be a bit of a kick in seedots to those who don't use Pokebank I think it would be a nice little perk of having Pokebank. --- http://www.youtube.com/watch?v=2WZsZReahfg Mewtwo has got his throne back! BST 780! Take that Arceus!