They had a good thing going with the original seasonal events. Massive XP, massive ammounts of money and strict restrictions making them very challenging and well balanced, i thought they were brilliant fun, i loved them.
But people moaned it was too hard, resulting in the restrictions getting removed which resulted in the challenge being removed. The problem is half the people want one thing, half want another. When something comes in, the half who don't like it will complain.
We see loads of complaining about something, PD makes a change, then we see loads of complaining about the change.
Seasonal events could be the fix to everything, they have been a great addition to the game, but without the restrictions they are too easy.