If you can point to where you went above and beyond, which improved the company's bottom line by $X, that will never hurt you in salary negotiations. In that sense, being able to justify your raise strengthens your position.

But you don't have to defend yourself against accusations of sinful greed, or justify why you should earn 3x what teachers or nurses earn. You're talking to someone who is paid more than you, not speaking at a college anarchists' debate about fat cat bosses. You don't need any special justification in that sense.