Developers that attend conferences in USA are very small and biased subset of total developers worldwide. It's even a very small and biased subset of the total

Developers that attend conferences in USA are very small and biased subset of total developers worldwide. It's even a very small and biased subset of the total developers in the United States. The majority (I would say vast majority) do not attend conferences. Sometimes because their workplace won't fund it, but often simply because they find no value in it. I personally gave up going to conferences years ago partly because workplaces treated it almost like they were giving me a vacation that I should feel grateful for, but it certainly didn't feel like a vacation. And afterwards I would try to itemize the value I received...to have nothing (talking to developers of the vendors face to face was, if anything, less productive than simply dropping a note on a discussion board). So that subset often comes from more moneyed employers, or are the "see and be seen" sort, or they really get value out of it. For the former two sets a Mac is a pretty likely device.