I think the point is that it's enough for people to feel comfortable and not think that they need another income source. I've known many software developers and

I think the point is that it's enough for people to feel comfortable and not think that they need another income source. I've known many software developers and some who had side projects. I only know of one other person besides myself who made money from any of them. I feel comfortable saying that most developers don't have side projects and of the small minority that do, an even smaller minority make any money at it.