"Nobody gets me. I'm the wind, baby!" - Tom Servo
"Push the button, Frank!"
They each let your bid count for half a coin more.
So if you manage to get both of them, does that mean each of your bids is a full coin higher? So could I bid only three coins for something that cost four coins minimum bid? And if I bid three coins for something, only somebody bidding five for it later could outbid me?
They do add together if you have both. Handy! Fear the person that has both.