You might be very surprised to find out how many of us pay for all of our own travel.
But I still think
volkswankin is correct. Yes, many of us do pay for our own travel, but I still believe the vast majority get it through work. Also, FTers probably only represent about 3-5% of all elites (and that's a high guess), so even if everyone on FT paid their own way, there would still be lots of other people to consider.