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According to Ohloh, it would cost 15 man-years to develop PostSharp from scratch by a team of professionals and the source code would have a value of 800 000 $. Amazing!
I've started PostSharp in September 2004 and have programmed mainly in my spare time. Right, that's a lot of time. Ask my wife how it is to live with a passionated developer. But anyway, it hardly reaches 15 hours per week in the average.
How to understand this difference in order of magnitude of 1 to 10?
First, notice that it is not exceptional in open-source projects. Compare with other projects and you will see. What is maybe uncommon in PostSharp, it is the complexity of the problem. But even this statement may be pure vanity.
So why a lot of open-source projects are 10 times more productive than commercial ones? I see a lot of factors.
When working on PostSharp: