Welcome to WebmasterWorld Guest from 18.104.22.168
The mediabot has nothing to do with the main index either, it just tries to understand what a page is about. 10 seconds is quite slow for mediabot, I have tested stuff before and have seen it immediately appear when a new page is asked for.
I wouldn't worry about this, it's natural (unless you don't have adsense on the page!)
There's no need to think how you can exploit this bot either, you can't.