The consistency of royal icing depends on many things, including the size of your eggs, but also the humidity/weather. So if you know what stiffness you want, it's perfectly valid to add sugar until it "feels right". (I usually make royal icing with meringue powder rather than fresh egg whites, which removes one variable from the equation [the size of the eggs], but I still have to adjust the sugar to get the right consistency.)
Marti
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