LOL
But since you mention upsell... 16GB --> 64GB is quite a good deal.
It's $100... or a few dollars more per month on a payment plan.
Many carriers now offer device payment plans instead of subsidized contracts. Here is Verizon's for instance:
$27.08/mo - iPhone 6s 16GB
$31.24/mo - iPhone 6s 64GB
$35.41/mo - iPhone 6s 128GB
Are you really gonna cry over an additional $4.16 per month for the next model up?
This is the sad part of what has become of Apple iPhone business. All current and future offerings are pushing the crop of new Apple customers towards a subscription model that is kind of semi-successful for them:
Monthly payments for a 16GB iPhone
Run out of storage.
Subscribe to Apple Music.
Run out of iCloud back up space.
subscribe to iCloud storage.
Run out of data, move to the carrier plan.
New iOS update. iPhone no longer works.
Get the new model with upgrade fee subscription pre-paid, and get a rush feel of being ahead, by paying more money.
New iPhone model and nothing else works: headphone and audio cables, charging car adapter, the case, etc...
Upgrade everything and continue overpaying.
Push beats crappy offerings to existing Apple customers.
New tv streaming services, and only works with the new hardware...
Start over.