What I am talking about is not so much the difficulty curve of the game by using all expansion, but more to get "story" and feel of an expansion in the game.
That is I like to experince the loctaions on the new boards and if you run with all three board expansions, that can be somewhat of a rarity. I have yet to see the Dunwich horror spawn in any game with all expansions for example.
The way my group handles this is, as others have suggested to only use certain mythos cards. I think what I was wondering is, if others like to play with everything. Because I dont personly like that, because of the issues I have with dilution of game flavor. 

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). But how many of those final combats would've been losses even without the EBs can't be accounted for. KW's Clue-seal rule adds a minor blip in difficulty, but I know that even without it, the last three final combats I've logged I would've still lost. Even if I could recall all my final combats to the very first game, my current final combat tally of 24-21 (in 104 games) would change taking KW's suggested ruling into account, because I don't clue-*****, so I don't have that many Clues to spend period.
. Wanker always seems to eat all my combat items at the start of battle. Heck, my first seal win vs Ith came when the BGotW Herald was used 