To be clear, I'm not educated in business so my thoughts are my own (potentially naive) conclusions.
However, there are some very sound business decisions behind us chosing to go with Brazil first, and to go with cheaper, low-end devices. I'm sure they know what they're doing more than I do!
As an aside, we do have versions of Fx OS running on high-end devices and it runs amazingly well. It's not our market though (for now) so it's merely a cool "look what we could do with the power" moment.
I hope we succeed too.