Ok, I admit I don't like how the content is paywalled, but…
it's only $4. While I agree that this game should not introduce more P2P-only content, I also think that people should stop overreacting and trying to make OOO look like greedy villains because as of now this new mission is extremely cheap - all of us probably spend more than four dollars in a day so yeah…
You are not alone:
http://forums.spiralknights.com/en/node/45618