Google already has my credit card information (Play Store, AdWords, et al).
This isn't about your card information. This is your transaction information.
Why would I want give it to yet another party like Samsung?
As I said, this is about spreading my profile data around. The more entitites that have a piece of it, the better. No one entity has a complete picture.
Company A knows: I spend X here, Y there, Z there.
Company B knows: I travelled here, there, and the next place.
Company C knows: my heart rate was all day, and how many steps I took
Company D knows: what i looked up on the web
Company A/B/C/D each know a bit about me, and try and sell some ad impressions based on it or whatever.
I think that is FAR better than giving ALL that to google or any other single entity. And then one person can stalk you simply by getting access to your google profile and get more detail than he could if he literally followed you around.
And indeed, why would I want my in-person payment method to be tied to a specific manufacturer? Google Wallet works with anything that can speak NFC, as far as I can tell,
What? You mean I can use Google Wallet with something that takes Apple Pay?
while a Samsung solution will certainly only operate on Samsung devices.
And if I'm carrying a samsung device in my pocket... that seems to be ok. I mean, what if one day I switch to an HTC phone? Seems like that's a decision for 2 years from now? Why worry about it?
I mean, I have a Visa from BankX in my pocket right now. 2 years from now I might use a Visa from Bank Y. Who cares? As long as what I have in my pocket today works where I want to use it today, I'm set.