About 1,000+ caps and Pew Pew, the unique laser pistol of assassin that was killing the other collectors.

Like this

In the sunset sasparilla factory festus is an old cowboy robot in a booth. You put 50 caps in the slot and he gives you the "prize" which is the history of sunset sasparilla. After he tells the story which is good you have an option 'You're joking right?' or something like that and then he says for the people who aren't happy with the story there is another prize which is in a room in the factory with a very hard lock and terminal but you get the key... basically the room is full of raided crates so it must have been a lifetime supply or something, (each crate has around 150 caps with the cap finding perk so you get ~1000 caps from them) but in the corner you find the body of allen marks, the guy who was killing people for the blue stars. beside him there is a laser pistol called 'Pew Pew' which owns big so that's the real treasure. Theres also a holotape of him when he's dying saying how he regrets killing ppl etc... (in fact this is the only voice tape i've come across in the game) the end.

The Legion took over Nipton and handed out lottery tickets. The winner got to live to tell everyone about the Legion. The losers got dead.