Why do i need to pay for all?

I just cant understand why in black ops 4 i need to pay 50 $ more if i just want the zombie maps , no one is playing multiplayer , bo4 is totaly forgotten , the blackout is empty , there is no one playing , and i need to play so much for something IM NOT EVEN GONNA USE. Please leave the zombie maps far away from multiplayer and other shits , no one need them , i just want to play zombies…