I’m skeptical given that reducing your colleague’s cost from around 1000€/mo all-in (inc. parking) to 200€/mo wasn’t enough that a further reduction to 50€/mo will tip the scales.
Fair, but I think people are not good in looking at the big picture. The old price was in the ballpark of the costs people notice (gas). But the proof is in the pudding, so we will see.
How do you know it was 1000€? Maybe if it was closer to let’s say 500 and an extra 300 was seemed like a reasonable price to them for the additional convenience.