BasilZero on 09 March 2024
Higher price especially on a platform that has less units than its predecessor at the time Remake came out are factors.
Also, possible that people bought FFVII Remake/Intergrade but havent played it yet so no point in buying Rebirth at this point. (Or some people didnt like the changes and had no interest in buying the sequel).
The game will likely have legs as it goes on sale.
