Of course Ron understood, every year he had suffered and given stuff up for his brothers. No birthday presents the year the twins got into Hogwarts or any other time something great happened to his brothers. Ron always lost out and he had enough of getting nothing, taking a moment to think he came up with a plan "Dad what if instead of christmas and birthday presents I could have one item new, like my wand. I mean Charles is more likely to work for Ginny than it is for me."