You neglect to realize that the GPL is a tough licence for a for-profit software company to work with. It is worded in such ways that it could suddenly render ALL that company's code open to the world simply because that company included a smidgen of GPL code in their codebase. Granted, no legal precedence has been set on this issue but because of that fact, this is not a chance that most companies are willing to take. If I was the owner of a software company, I wouldn't want to trust a court to decide whether or not I am able to control the distribution of my source code simply because the GPL had "invaded" my codebase.
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You neglect to realize that the GPL is a tough licence for a for-profit software company to work with. It is worded in such ways that it could suddenly render ALL that company's code open to the world simply because that company included a smidgen of GPL code in their codebase. Granted, no legal precedence has been set on this issue but because of that fact, this is not a chance that most companies are willing to take. If I was the owner of a software company, I wouldn't want to trust a court to decide whether or not I am able to control the distribution of my source code simply because the GPL had "invaded" my codebase.