People like surprises.
Always nice to be "rewarded" for something when you weren't expecting it.
By the time the next round of surprises are going to happen, I will most likely have expired. Santa Claus isn't working anymore. I don't think it makes sense to hide these very difficult missions that require 1k+ answers. Are those mission actually still working? It would be nice to see the current progress.
Anyway, I vote for no more surprises.