Maik L wrote:
For example it could be required that the investigators own one relict each to successfully close every/the last gate? Or something similiar? This would be a way to actually strengthen the thematic coherence of the game in my eyes.
I guess that's the way to go - come up with some such variant or house rule to counter that tendency when the herald is in play. And one of the good things about AH is that such modifications are so easy to implement. Just come up with a short thematic introduction why the investigators need to secure a certain amount of Exhibit Items (or, to make it even harder, a very specific Item!) before they can win and off you go. If it turns out too difficult, you might try to offset it by slightly changing the winning conditions in their favor or granting them some other advantage.
Actually, yesterday I played Scenario 4 of the Arkham Horror Spanish League (Season 1) campaign. It has the CotDP expansion and the Pharaoh herald in play and while it doesn't do much about the Exhibit Item problem, it has another interesting thing going: at the beginning of the game, every investigator is either cursed and dealt a Benefit or blessed and dealt a Detriment. Just another way how cards/elements that don't get used often might be given more prominence.