You are Absolutely right !  Its happening with a lot of selling multiplle items and the way to check if they are manipulating the cassini, best match is look at ther sales for the month then look at their feedback for the month as we all know you get %50 at best and last of all very important see if their feedback is private.  my "opinion" on how you can manipulate best match, sell 10 items make your listings private (so no one can see, like they do) get your mates to buy one a day till 5 or 8 are gone you can list best price and accept their 1 cent offer with pay on pickup (you getting the idea already) Bang up the front you go BEST MATCH HERE WE COME then sell the other 5 normally and here is what kicks it a long you get excellent feedback from your mates.  dosent matter if you jump thru ebays hoops with their descriptions or pictures if someone clicks on your listing and doesnt buy, to the end of best match you go and so forth type in "funny sticker" and watch who dominates the best match NOTE... This is my opinion and guess only on what happens and if ebay removes it then Im Right...