- Decide which civilization.
- Decide which leader.
- Decide traits that suit the civilization.
- Decide traits that suit the leader.
- Composer(s) to do the peace & war scores & any unique music for scenario.
- Research & write dialogue for leader.
- Do casting for voice actor for leader (must speak a similar enough language fluently and so on).
- Schedule recording session in studio with voice actor and sound engineer(s) and actually do it.
- Research the leader and civilization and have writer(s) do the Civilopedia entries.
- Art director to decide general direction for the leader scene and the two unique units/buildings.
- 3D artists build the meshes for leader scene and the unique units/buildings.
- Texture artists do the textures for the leader scene and two unique units. Shaders especially may need extra work.
- Illustrator(s) do the 2D interface artwork for Civilopedia and unique unit/buildings.
- Animators animate the leader, horse (in this case), unique units and buildings. Just think of the speech, facial expressions, gestures, unit idle animations, fighting animations, movement.
- Sound engineer creates the sound for the leader scene and unique units and makes it play at the correct instances (syncronized properly).
- Programmers add code/scripting for all of these new things (a lot of stuff!).
- AI programmer/Game designer(s) create the AI personality suitable for the leader.
- Map maker(s) make the world for the scenario.
- Game designer(s) set up & tweak the scenario.
- Testing, balance concerns. Q/A. Smooth integration delivery through Steam must be set up.
Even listing these things is exhausting so I'm not going to thinking of what else is missing from it. You can imagine that these things cost real money - paying all those professionals to do all that work. Game creation is a very complicated expensive task these days.
Lets see:
Points 1-4 = 10-15 minutes. Heck, probably not even work time but a creative flash wiping my ass when sitting on the toilet.
Point 5 = a day at max. Meaning approx 1.000 dollars cost. Dont be fooled though, its probably half that. Musicians dont get paid well.
Point 6 = 30 minutes. Research? Please, be realistic.
Point 7+8 = 1 hour. Fluently ... Lol.

Next you'll try to tell me Ramses is actually speaking egyptian. You do know that no one actually knows how that language was spoken? And thats just one example. Maya, Incan, Aztec. Much the same.
Point 9 = 2 hours. Wikipedia is your friend. Dont mistake the entries here for anything of actual scientific value.
Point 10-13 = a day at maximum. Professionals in the grafics dept. dont need much time, you'd be surprised.
Point 14 = Okay, if I'd actually go and do that myself it'd take up to a week maybe, to get all needed movements. Nowadays you get those out of the box though, so maybe 1000 dollars for the program.
Point 15 = this is done in point 5. You dont think the composer is someone different, do you (unless they take a classic piece and redo it).
Point 16 = 2 hours. Actually this is just a mod and it takes the coder not even a day to add the few lines to include some grafic and sound content.
Point 17 = 1 hour. Creating an AI could take sometime, but I am VERY sure that they have a certain engine for that where you add modular traits. Anything else would be very uneconomic and blown up.
Point 18 = Now this could actually take some time. I'd go for 4 hours here, since the map makers have lots of experience.
Point 19+20 = 0. That actually made me laugh.
That sums up to roughly 40 hours of work. Lets make it 50 hours.
Add another 20 hours for the guys of the finance dept. to get everything ship shape (aka bore in the nose and keep the blank look).
Putting it on Steam takes a couple of clicks. You dont think they change their coding or anything when someone sells some soft over their platform, do you.
Overall I'll grant 100 hours of work. And that stretches it. We are NOT talking about an expansion. We are talking about a map and a single Civ. A single modder doesnt need that much time for that, minus the video sequences and voices.
Then lets say 100 hours for 150 dollars the hour. Which is way too much, but its about what coders in the industry take for their work (sometimes).
Makes 15.000 dollar in my book. Cost. Since I am in a spending mood, I'll double it to include personnel costs.
30.000 dollars.
So only 15.000 buyers of Civ5 would have to buy the DLC to make profit.
Last figure I read was 350.000 copies sold in September
Source.
10% is a very low figure. I'd guess its much higher, but would settle for at least 30-40% .
That would mean that probably 100.000 people buy the DLC.
500.000$ profit with not even 50.000$ cost. Thats ... nice.
