From what I read in this thread http://forum.thesettlersonline.com/t...Adventure-Loot,
the drop chance of certain epic buildings has been SIGNIFICANTLY reduced.
Seeing as that for example with Invasion of the nords which costs close to 1500 gems that means a reduction of 33% to a mere 5%, also means that it should no longer be the 1500 gems price. And it's the same for several other adventures.
So to compensate for these reduced droprates on good epic buildings, maybe time to reduce their price to reflect their "new" contents better?