I see your parry and offer these
ripostes:
For MagicBands:
Disney says wristband boosts sales in disneyworld test
(I've not posted enough to insert the actual link).
(but I have -- here:http://investorplace.com/2013/07/disney-sees-spending-bump-from-mymagic-wristbands-wearers/ )
For FastPass+:
The Might Men of Mouse (on the new Touring Plans Podcast website), contend that FastPasses are a way to get guests to wait for attractions out of a line. Each moment you spend in the park and (not in a line) gives guests chances to drop their hard earned dollars into Disney's via food or souvenirs. Further the increased guest satisfaction encourages staying around these parks for one more day and not wandering off to those nasty other near by parks.
Should either of these be true, than this electronic endeavor will have a direct and measurable effect on ROI. Since this is intimately intwined, and you have to use it to actually pay, I would think Disney would accord it more attention.
BlackestRose