People don't ask to see your passport, you just have to open your mouth for them to know where you are from, when abroad.
Discounts, upgrades and such seem to be quiet common amongst my friends, non of us are rich but we are all nice people, the pushy ones tend to not gain and be miffed about it, so maybe it is more who your are and how you act, that is respected and rewarded.
Sat and watched a family member have a paddy fit on holiday, trying to get an upgrade, got nothing, I waited quietly, even said sorry when they had final been sorted and gone, manager told me he pitied me, then swapped our rooms for better ones, just because he could...