And overwhelmingly, if you want to sell more copies of what you spent your time on, you publish from levels 1-8.
An excellent point, Steve. When you look at the Top 30 Adventures list that Paizo published in 2004, most of it was for levels 1-8, with only 7/30 (23%) single-starred (*) titles falling at or below that range, and with only 5/30 (16%) three-starred (***) titles falling completely above that range (where * includes both lower and higher than 8th level range, and *** is higher than 8th)). So, 16/30 are of levels 1-8 or less = 53%, while 23/30 = 77% are for lower through 8th levels (with some overlap higher too).
30 - The Ghost Tower of Inverness
29 - The Assassin's Knot
28 - The Lost City
27 - The Sinister Secret of Saltmarsh
*** 26 - City of Skulls
25 - Dragons of Despair
*** 24 - City of the Spider Queen
* 23 - The Forgotten Temple of Tharizdun
* 22 - The Lost Caverns of Tsojcanth
* 21 - Dark Tower
20 - Scourge of the Slave Lords
19 - Against the Cult of the Reptile God
18 - The Hidden Shrine of Tamoachan
17 - Ruins of the Undermountain
16 - The Isle of Dread
15 - Castle Amber
* 14 - Dead Gods
13 - Dwellers of the Forbidden City
12 - The Forge of Fury
11 - The Gates of Firestorm Peak
*** 10 - Return to the Tomb of Horrors
* 9 - White Plume Mountain
* 8 - Return to the Temple of Elemental Evil
7 - The Keep on the Borderlands
6 - The Desert of Desolation
* 5 - Expedition to the Barrier Peaks
4 - The Temple of Elemental Evil
*** 3 - Tomb of Horrors
2 - Ravenloft
*** 1 - Queen of Spiders
For some additional analysis, see the level grid charts at the Acaeum:
- AD&D modules:
https://www.acaeum.com/library/addmodchart.html
- D&D modules:
https://www.acaeum.com/library/ddmodchart.html
Moves, graduations, marriages, kids - life in general - all works against organic high level play. Let alone the mercurial nature of what I'm fascinated with at the moment. We're lucky that D&D came out when it did, at the last gasp of an age where it was most common for someone to live their whole life in the town they grew up in. Because that sort of stability is necessary for high-level play, also.
One of the reasons I'm very pro-VTT is that it might be the tool that restores the paradigm Gygax and Co presumed; the player pool being stable.
True that, on both fronts. While I've gotten more mid- (6-9th) and high-level play out of DMing game conventions over the past decade+, I've played PCs in our local Wilderlands campaign from 4/4 to 13/15 (semi-retired), from 1st to 10th (retired), and from 3/3 to 8/9 (current).
For some additional anecdotal analysis of campaign play longevity in the modern era, see Anthony Huso's blog at
https://www.thebluebard.com/post/what-happens-in-the-abyss and
https://www.thebluebard.com/post/dreams-of-darkness which have some nice summaries of his campaign history as part of the final adventure he wrote as its capstone.
Allan.