Put another way, if whistles are "shares"...

The rules: You have 10 dice. Blow a whistle if you get a total roll value over 40. If you roll 60, you get pizza and ice cream.

Bob can roll the dice REALLY fast. He's blowing his whistle every 2 seconds. We get sick of this, so we change the rules. We tell him he can only blow it if he rolls over 50. This shuts Bob up a little. We know that he's doing his thing, though, rolling his 50+ occasionally.

Alice only has one arm, and it barely works. She hasn't blown her whistle in hours. We change her rules so that she blows the whistle on anything over 15. Now we can see (and hear) that Alice is actually doing something over there. 

Alice is now blowing her whistle about as often as Bob. Bob does get treats all the time, though, because he's rolling like crazy. Eventually, Alice also rolls a 60 with her busted arm and gets her pizza and ice cream.