In much the same way if the original text was 'I owe you 1 million dollars' and the collision text was 'sdf86*&6989h,mni lkj99j' its not significant.
Hey, Nick. I want to confirm that I've installed GPG correctly. Would you mind signing some random text, say, "sdf86*&6989h,mni lkj99j", so I can test it?
I'll admit I agree with your point, though. The demonstrated collisions in MD5 (none have been demonstrated in SHA-1 yet) varied four high-order bits. So it'd be fairly unrealistic (in the real world) to generate a useful collision. Here I define "useful" to mean at least one side has to be intelligible (as opposed to your definition of having both sides be intelligible).
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