(On people buying 2 phones so they can profit on the 2nd)
This is a poor excuse. The "way of the world" is written by its participants - every individual who makes a conscious decision.
It winds me up in much the same way as people who say "oh I'll vote for {bad guy} because it's not like {good guy} will win, and one person isn't going to make a difference". Sure one person can't change the world (extremely rarely anyway) but the way of the world or the balance of power is the sum of individual decisions (or votes). The fewer people who have this "everyone else is doing {bad thing} so it's ok if I do it too" attitude, the less likely it is to be "the way" in the first place!
Of course, we're all greedy from time to time, it's only natural. But excuses like that are pretty transparent. If you want to be greedy, that is your freedom to do so, but don't pretend it's anything other than *your* choice to hoard items in limited supply and screw anyone else who wants a chance etc.