Implications of pure and constant functions

> I hope you're not suggesting that projects where entry is more closed,
> such as proprietary development do not experience "widely varying
> quality" of code.

In my experience, it isn't much varying... it usually is so bad it's not 
even funny to think of it twice.

On the other hand, proprietary software that is written badly is more 
easily discarded, as it fails to work at all in most cases - unless it's 
so proprietary you can't switch for a different one. On Free Software, 
badly written software can easily be patched up so that it works, and is 
kept in circulation of months and years.

I think the problem is in the big numbers, there is probably way more 
Free Software than proprietary software being developed by amateurs.