Thinking about this the last couple of days, and I believe the devs strategy in this game (right or wrong) is based on frustration.
They want people frustrated enough they will spend money, thats why the events don't get announced with some time in advance for people to prepare or because things are overtuned etc..
Again, they need to make money and it seems to be working out, the frustration seems to be a good drive. For me personally, I spend the most on double drop events and other enjoyable things. But yea the frustration gets to me, dunno if it hold me to the game on the long run tho.
