When i logged in tonight, there were about 20 5* players on the market. I added a couple to my watch list, and came back later to check and see what bidding was like ..

Most of them were gone:
Click image for larger version.  Name: Market1.jpg  Views: 50  Size: 69.9 KB  ID: 1380

So i took the above screenshot, then reloaded, and there were a whole bunch of them again ..
Click image for larger version.  Name: Market2.jpg  Views: 47  Size: 93.0 KB  ID: 1379

Came back 20 minutes later and:
Click image for larger version.  Name: Market3.jpg  Views: 43  Size: 72.5 KB  ID: 1378
Notice how NONE of the players in the last shot were there 20 minutes earlier.