What's in a price tag?
A number of comments have emerged along the lines of 'Why is Cossacks, which has the same amount of features as Common Sense, $/€5 more expensive?" The answer to that question, quite simply, is that they do not have the same amount and size of features.
When designing an expansion, we make a plan for the number and size of features that will be in said expansion. We break up features according to the following classifications:
Mega - A mega feature that represents a very large time investment and a major change in how the game can be played, such as introducing new game modes. The Nation Designer and Random New World are the only mega features to date.
Major - A major feature that takes a large time investment and has a large impact on the game. Examples of these include Estates from Cossacks, Subject Interactions from Common Sense and the Army Planner from Art of War.
Medium - A medium-sized feature that takes about an average time investment and usually has a fairly large impact on the game. Examples include Development from Common Sense, Nahuatl mechanics from El Dorado and Horde Unity from Cossacks.
Minor - A small feature that can be implemented quickly and generally has limited impact on the game. Examples include Threaten War from Cossacks, Return Province from Common Sense and Selling Ships from Art of War.
We make sure that each expansion has a good mix of major, medium and minor features (with a mega feature instead of several major ones in CoP and ED) and then sum up the total number of features where mega features are worth 10 points, major features are worth 6 points, medium features are worth 3 points and minor features 1.5 points. This is then divided by price to create the actual value, which we ensure stays very close to the value for money in previous expansions (our highest 'value for money' expansion is Wealth of Nations owing to the low price tag, but it's only 5% more value for money than The Cossacks, for example). We never factor free content into the price - while Art of War came with a mega map rework, this had nothing to do with its $20 price tag, and neither did the Random New World rework influence the Cossacks price tag. We set our price purely according to the actual features you are getting for paying for them.
In total, Common Sense had 2 major features (Subject Interactions, Parliaments), 4 medium (Protestantism, Development, Buddhism, Devotion) and 6 minor (Free Cities, Remove Electorate, Pause Westernization, Dismiss Advisor, Government Ranks, Return Province) features. This gives a total of 33 points, or 2.2 points per $.
In total, The Cossacks had 2 major (Diplomatic Feedback, Estates), 7 medium (Advanced Change Culture, Build Directly to Army, Improved Espionage, Horde Unity, New Subject Interactions, Native Policies, Tengri) and 9 minor (Name Your Heir, Victory Cards, Concede Colonial Area, Distribute Spoils, Construct in Subjects, Threaten War, Forced Migration, Declare Colonial War, Raze) features. This gives a total of 46.5 points, or 2.32 points per $.