I will tell you - there is 2 options.
1) You are a "chosen*"
You will get 5k pumpkins and if you are also uber dps u will get a good prize.
2) You are not a "chosen*"
You wont get any 5k pumpkin and you wont win anything but stupid prizes no matter what your dps is or how many hours ur hunting are. If mindark detect that your dps is anyway so bad that you have not a single chance of beating a "chosen*" they will give you one ore more 5k pumpkin very quickly so they are sure u keep spending ur peds thinking u may have a chance. But you dont !
Good enough explanation to you?
* Chosen définition : player selected to be able to win the event before it start. Best chance to be a chosen if: you are swedish, have close relationship with some ma staff. Check winners list of all last mayhems of any kind for more informations
Evil mode off :-D