I don’t know. I prefer to unlock characters through playing the game, not with my wallet.

Also you can have 2 different games with 25 fighters each every 4 years, versus having 1 game with 50 fighters for 7 years with the same money as 2 games. I just prefer the 1st option.

Just support the game for 2-3 years and make a better one after. If you need money for the support put DLC with soundtracks and artwork.