Well the only income they had was from retail sales... So even without exact figures, if you consider the amount of people working on the XIV project (JP/NA/EU staff), the amount spend on marketing (all right not that much, but still there was some advert here and there), server upkeep, etc. I hardly doubt that what they earned did cover over 1 year of expenses.
And I'm not even gonna talk about pre-release dev costs...