The raffle is a way to possibly earn some money or food. You buy a certain amount of "tickets" (no more than five). Each ticket costs a certain amount (based on your networth), and is assigned a number. The computer then selects a number at noon each day. If your ticket number matches the selected number, you win! Your prize is the jackpot of the ticket costs.
Because the computer always picks the number of one of the tickets, there is a winner every time. Don't be afraid to buy a ticket, if no one else plays, you'll always get your own money back.
Go forth and win!