First come, first served is used all over the place. If I get in line behind someone at a store, my expectation is that I will be helped once the person in front of me has been taken care of.
I am fine with it. When I preordered in early October I figured that I might get in the game on the 18th. Now I am guessing that I may get in on the 16th. Who knows I could luck out and get in on the 15th.