What about doing something similar to the gameshow Red or Black? On the website you should make people guess what happens, giving 2 choices. Such as will the DHV bonus pay more on Gates of Hell or High Voltage? Anyone who gets the question right goes to the next question, and everyone who gets it wrong is eliminated. When you get to around 10 players left, award everyone with a slot bonus of their choice! (from a set selection)
Zervarus