Interesting data for me:
Egosoft X-Series:
X3: Terran Conflict $15.99 1,509,533 ±70,070
X-Tension $4.99 1,119,563 ±60,396
X3: Reunion $9.99 999,244 ±57,073
X2: The Threat $4.99 866,979 ±53,178
X: Beyond the Frontier $4.99 855,032 ±52,811 04:17
X Rebirth $39.99 788,473 ±50,722
(numbers could be skewed, there was a free weekend recently)
I hope that was a wakeup-Call for Egosoft and they make X-4 next and not this miscarriage again.
(but where is X3 Albion Prelude?)
Our beloved Grand Strategy Developer: Paradox Development Studio
Crusader Kings II 1,617,906 ±72,524
Europa Universalis IV 1,477,107 ±69,318
Europa Universalis III 416,423 ±36,891
Hearts of Iron III 313,171 ±31,999
Victoria II 236,371 ±27,805
Victoria: Revolutions 107,519 ±18,758
Crusader Kings Complete 69,119 ±15,041
March of the Eagles 66,559 ±14,760
Hearts of Iron II: Complete 59,733 ±13,983
Europa Universalis: Rome - Gold Edition 58,879 ±13,883
Taleworlds:
Mount & Blade: Warband 1,716,038 ±74,675
Mount & Blade: With Fire and Sword 937,805 ±55,299
Mount & Blade 753,487 ±49,587
Idea Factory:
Agarest: Generations of War 157,865 ±22,727
Hyperdimension Neptunia Re;Birth1 53,760 ±13,265
Agarest Zero 52,906 ±13,160
Agarest: Generations of War 2 24,746 ±9,001