I just ordered a few more from you, and my first action will be to sharpen them. Actually I'm going to sharpen the old ones too. That's just my feedback, file is easy to use, and for people who can't put stakes in a 2 gram stake sack out of harm's way, I guess having them be dull is a good idea, since it's easier to sharpen than dullen them.
Added: ok, sharpened the old ones. After looking at them, perfection to me would be about a 1/4" of taper, or a touch more, ending in a rounded flat 1/16th inch or so blunt end. Harder to grind down though for you. This would get through hard rocky soil the best I believe.