I'm so glad City Skyline had such a success, because I feel that other Paradox Interactive games wouldn't have existed otherwise.
As an avid player of Stellaris, and as someone eyeing the Crusader Kings series or Europa Universalis, I'm feel that Paradox games have DLCs done right. They are clearly on the expensive side, but they are contentfull, and feel less shameless than EA counterpart (especially with the Sims who has the same DLCs over and over again).
On a side note, there is also Caesar III (& Pharaoh) on Gog, and it's still a gem.