You're probably aware of the phenomenon that is watering down: Not enough gates open at Dunwich and the chances of you pulling an appropirate encounter for Another Time/Lost Carcosa/Underworld/Unknown Kadath is slim to none. I have the perfect solution for this: A small box expansions that expands the big box expansion. For example, an expansion for Dunwich Horror can include: Mythos cards that open gates at Dunwich; Gate cards for the new other worlds; more encounters for dunwich locations, and maybe even some investigator cards if you feel like it, but it would be prefectly fine without them.
The number of cards that would substantionally increase the rate of these rare events is something along the line of:
Dunwich Horror Expansion (Small Box, Requires Arkham Horror):
20 Mythos cards, all opening gates at Dunwich locations
40 Gate cards, 10 per color, all associated with Another Time/Lost Carcosa
45 Location cards, 5 per Dunwich location
Kingsport Horror Expansion (Small Box, Requires Kingsport Horror):
5xUnusual Phenomenon Sighted in Arkham!
40 Gate cards, 10 per color, all associated with Underworld/Unknown Kadath
60 Location cards, 5 per Kingsport location
Price: 14.95$ each
Also, there can be a booster-sized expansion for KiY and CotDP, containing:
KiY: 10xThe Next Act Begins!
CotDP: 10 Exhibit Item cards
These should not boosters in the sense of many of them, 1 or 2 for each of these expansions would suffice.
Price: 4.95$ each
Thoughts?