I'll give a relevant example: IMC, NPCs tend to be around 10th level, with 2/3 of a city's total levels being in an NPC class (usually Expert, but some Aristocrats too). I do this because my meta-plot extends through Epic levels, and I don't want to
PCs are the focus of the story, and their actions are the heroic battle-tipping ones -- not always the "slay-the-leader" type of battle-tipping, more often the "get-vital-info-to-base" type, or even the "scout-and-find-stuff-out" type.
Missions have multiple objectives, the first usually being "don't get caught". Killing targets of opportunity is encouraged, so long as you don't endanger the other more important goals of your mission.
When the PCs get to around 10th level, they start attracting the attention of powerful players on the cosmic stage. When they get to 30th level, they
are powerful players on the cosmic stage. In the mean time, they get to deal with -- or avoid -- threats that range from CR2 to CR20, as appropriate for the area. Threats of CR30+ are certainly around, too, but they aren't on the wandering charts.
Kahuna: I tried to bias *both* extremes -- they should both sound Ebberon-ready.
