googlebot visiting my google analytics virtual pageview URLs

For a certain group of pages on my site, I send google analytics a virtual pageview. So, as an example, instead of the page being /username, I track it with google analytics using /profile/username like this:

_gaq.push(['_trackPageview', '/profile/username']);

Works great it seems. Except I'm seeing TONS of the above virtual URLs in my website开发者_开发问答 logs with googlebot as the user-agent! Why is google visiting my virtual URLs? Did I do something wrong above? Is this normal?

It looks like this is a long-running problem, going back to December 2009.

Unfortunately, there does not appear to be any explanation as to why or how this is happening.