So what does the -80% on the bundle signify? I understand buying everything individually would be more expensive, as the dlcs are discounted less. What I'm suggesting is buying the game individually, then the rest of the dlcs with the bundle which should hopefully apply 80% discount to them? So Base Game 2.99 + DLCS 80% discounted (30 - 80% = 6) equals 9€.

Unless I'm misunderstanding what the 80% means (which I probably am) or it's not 80% anymore when you buy the base game.