I think another major factor that often gets overlooked is simply the timing of when SS was released. It was one of the earlier Ren'py games out there and had the benefit of having not as many options.DC found himself in a cycle of "eternal" income product of the ignorance of new players (that's why I believe he hardly make a status update).
If it was released more recently, say at the same time as a comparable game in style and development/release cycle tims, What a Legend, then it would probably be much closer in Patron numbers.