I stated that FB has the Toys R Us business model: People are always producing kids; the internet always has new generations coming online. They are building for the COMING generations -- not the current.
Another here on HN summed it up best: FB's new messaging platform is for those who think FB IS the internet.
Additionally, this is further reason why I would not want/use a FB payment system. I dont want to have to be logged into FB / have an account on FB in order to pay something.
We have all seen how maverick Zuck is with others' privacy...
Disclaimer: I have never, nor shall I ever, had a FB account. I refuse to participate. While I see the value it provides others - I have been perfectly happy to not have had an account - and even gone as far as asking friends and girlfriends not to post pics or any other info about me to the site.