Thats the real answer why Imperator:Rome is not included in the Grand Campaign. It's the fanbase.
It would be okay if they say so - they dont.
the problem: no attention brings no fan base
It's a bit more complicated then just "the fanbase is too small".
The current order of games works out very nicely:
1) Crusader Kings 3 is the newest game, and the one that will want to promote the most. Since it's the first game in the sequence it'll be just a normal game of CK3. It's nice and safe (no risk of broken/boring starting position) and they can show of the full suit of features of the expansion.*
2) Next you get EU4. EU4 follows up from CK quite nicely (no time gap) and a lot of the major EU4 powers already exist in CK3 (or can content can be easily rewritten to make them fit). And, if everything goes horribly wrong and you end up with EU4 start that simply doesn't you can just play in the two thirds of the EU4 map that's not in CK3. (In fact, they might want to do that anyways since that's the focus of the new expansion.)
3) Following up is HOI4. The time gap between EU4 and HOI4 is exactly one Vicky3 small, a lot of the CK3 and EU4 great powers are still around, and HOI4 is less reliant on content then most other PDS games anyways. (Just need some big power blocks that can have a world war). So HOI4 should be fine, no matter what happens in EU4.
4) Finally, Stellaris. Stellaris doesn't really follow up from the other games at all. So there is also nothing that can go wrong.
Now imagine if you included Imperator:
1) Imperator completely breaks the CK3 start. No Christianity, no Muslims, no pope, no France, no HRE, possibly no Vikings, quite likely none of the established powers, etc. Instead you would just end up with one large empire that would spend the first four to five hours of the stream gradually disintegrating. You would have an easier time listing the CK3 features that Imperator doesn't break. And remember CK3 is the game PDS wants to promote the most.
2) - 4) EU4 is just as broken as CK3. HOI4 could maybe work, but would be completely removed from reality. Stellaris still doesn't care.
So yeah, while audience size may have something to do with it, it's less "they don't want to market IR" and more "they don't want to ruin the marketing of all their other games for the sake of their least popular franchise".
*In case you haven't used a PDS converter before. converted games end up quite "content starved" because e.g. base EU4 has a lot of content for "France", but none for "Gaul"
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