A few days ago, someone managed to decode the algorythm behind /random calculations, it didn't take long to exploit it and release an addon to get very high /random 100 everytime : Highroller. This AddOn uses an advanced algorithm to time your roll requests to the server in order to increase your average roll value.
Taken from mmo-championTime to win all those rare item guys XD. Use it before it got nerf ......LOL it's a joke