[arendtio]

> The problem is the assumption that people who do that are "better" in some way.

Well, your argument doesn't prove that the assumption is wrong.

In my experience, everybody starts with closed source code and before open sourcing anything the developers asks himself what kind of code he wants to show as his work which in itself triggers a desire for quality and makes them better(tm) developers. Therefore, I would assume too, that the mean open source developer is statistically a better developer than the mean closed source developer (everybody). But that doesn't mean that every open source developer is better than every closed source developer. It just means that when you are targeting open source developers you have a higher chance of finding a good developer.