Yes, there is definitely some rotation happening. Most low to -mid tier sellers have an arbitrary ceiling set by Ebay in regard to what they can sell per day. You can pretty much guess the total sales you'll get each week on Ebay. Guy's like Dick Smith, Harvey Norman, Good Guys, Target, Mrtoys etc etc don't have this issue. They can sell 1000's of items a day, even with their higher prices, and postage tacked on, terrible feedback, and general non compliance with most of the crieria (that we know of) to achieve the best possible results with the "Best Match" algorithm - it's just not an even playing field anymore. This is part of the reason why I moved on to Amazon months ago.