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I agree with you to a point Herko. I mean I am a linux freak and its open source however that does not seem to matter as there are many flavors of it that are distributed on cd rom at your local bestbuy store.
Any GPL code is not like Microsoft software that is copyrighted. When authors release software under the GPL they know that people are going to use it, hack it, change it, sell it, charge for it, you name it and people will do whatever they want with it.
Some people may not like this but its a fact if life.
I mean take a look at prozilla and dotcombuilder. They have many open source software that they charge users to pay for to get from their "members" area. None of the original credits are intact in those either but no one seem to say anything about it.
Look at their auction software. Do you know where that came from? Its PHPAuction. A gpl software however there is no license in this that indicates it howerver if you inspect the code you will see that they are EXACTLY alike apart from the layout (design and colors)
Bottom line is, authors of GPL software are not stupid. They all research their options before releasing software as GPL. And as such they also know that people are going to do things with the software that no one can imagine.
Just my 2cent worth.