As for the $15.00 per month - that is a nothing fee that I would not care about actually. Pinching pennies makes no sense when you are rich - your time on the planet is worth a lot more.
Lots of people would disagree with that, including myself. It's not that $15/month will break the bank, it's that I'm just not seeing $180/year worth of value there...and I've got four Apple watch users on my account, which means it would run $60/month, or $720/year for approximately .5-1GB of extra data usage every month. That's just not worth it for the rare times I don't have my phone near me.
Anyway, the 'nothing fee' argument works both ways--the cellular usage is so small for most that the providers wouldn't even notice the difference, especially since most AW cell data is data that would have otherwise been consumed by an iPhone.
I mean $15.00 - it's like debating whether to pay a "Netflix" monthly fee - not a big concern.
Except it all kind of adds up when you have to buy Netflix, Hulu, HBO, Showtime, etc...all for $15/month each.