I agree with @Ποσιδονας
We know the game pretty much and it's known that there is a higher troll factor in the Cup games , in one of the two legs.
(as also in a C.L. groups game, vs the weaker team of the group).
So if the troll will hit in the single game, Cup is over and for many managers (like me) who are going for the treble, the season is over.
Increasing the tanking factor too - This season is f.. up, let's tank.