this might be a little far-fetched but i have a theory.
the game wasnt hyped too much was it? so they set release date for feb. 5th (i think) then they actually release it 5 days earlier so if your in store your like "oh man, the store released it almsot a week early, i should pick it up!" and those who had no intentions of buying the game end up buying it.
the release dates were weird for me. i didnt know if it was out or not but i never noticed that it was out 5 days early. i didnt know the officail date, it just seemed fishy that i wasnt hearing much about it but the gamestop website said it was shipping.