Microsoft Live Search – trying to increase their referrer percentage artificially?

I’ve noticed a lot of my traffic supposedly is coming from Microsoft Live.  However, looking at the referring URLs, something fishy is obviously going on:

  01 May, Fri, 09:10:38    http://search.live.com/results.aspx?q=authentication  
  01 May, Fri, 09:19:00    http://search.live.com/results.aspx?q=virgin  
  01 May, Fri, 10:51:20    http://search.live.com/results.aspx?q=usability  
  02 May, Sat, 15:55:08    http://search.live.com/results.aspx?q=since  
  02 May, Sat, 17:43:10    http://search.live.com/results.aspx?q=about  
  03 May, Sun, 11:49:51    http://search.live.com/results.aspx?q=issues  

I can only conclude they’re trying to increase their referrer percentages to try and increase ad spending.  I’d be interested to know if anyone else has noticed this, or can perhaps explain it.