Three reasons off the top of my head: My first is that it only worries someone if it actually works. Think back to the number of times that trick plays actually worked at that level of play where the guy throwing hasn't actually been a college QB in the past. I mean trick plays in the NFL? Really? Success is pretty rare. These guys are pros who've seen most everything between YAFL and today. You can point at our onsides kick during the Superbowl. That's just one success. Then how many unsuccessful trick plays can you honestly bring to mind? Secondly, Mark's a little... well volatile. He seems to not always think things through as he's on the field. He gets out there to do that and his adrenaline could see that ball just about anywhere but where it should be. I think I'd rather see AP or Alvin in charge of the ball if they really have to do that play. Thirdly, there's a reason good QBs are so rare...