In the expansion pack, when you complete 1 of those expansion mission get 2 3* or 5* items, not recipes. Even if that person doesn't bother unbinding and selling it at the auction, imagine how many crown you can make in just one run!
So is there anything stopping the people who buy the expansion pack from getting waaay too many crowns (which in turn will drive CE prices up)?
You only get mission rewards ONE time for finishing a mission and thats what the new weapons are, mission rewards.
The mat from killing Warmaster Seerus is pretty much a boss Token so really, i don't see what you can possibly be on about.