Pick one: A) Because they're boring? B) Because there are billions upon billions of them? C) Because they were never particularly attractive coins to begin with, and in their present form they're downright ugly? D) Because they no longer make sense with regard to economics and commerce? E) All of the above?
Yeah, but only because the US gov't hasn't seen fit to make them make sense. From what I've seen, 50 cent, 1 euro and 2 euro coins seem to work fine in the EU countries.