It's if you have hundreds/thousands of pages then google (and other search engines) will only search so many each day, so by setting the priority you are telling crawlers the order in which to go through your site.
If you have a smaller site then keeping them all at 0.5 is fine. However if there are pages that get updated often, then cranking up the priority won't do you any harm, you are just telling the search engines what you think they should be looking at first.
That's how I understand it anyway.
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