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No-follow doesn't help here.
It's to do with the quality rating of Adwords landing pages. If you've got outbound links to other sites, you run the risk of getting a low quality score. So, one way people get around that problem is to use these types of scripts.
Can also help with people who steal your affiliate links. Some dodgy toolbars redirect your links via the toolbar-owners affiliate number, meaning you don't get the credit.
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