Ajax bob card set estimate question

I don't exactly know what "card set estimate" is meant to represent or mean in AJAX Bob. Could someone help me?
Andrew
Andrew
Conquer Club, a free online multiplayer variation of a popular world domination board game.
http://www.tools.conquerclub.com/forum/
http://www.tools.conquerclub.com/forum/viewtopic.php?f=6&t=39131
0ojakeo0 wrote:i think its how likley you are to get a card set