It's the probability of winning. I mean seeing how big the jackpot is, tendency you will already imagine yourself the jackpot in your hands and already thinking of what you will do with it. I do that every single time whenever I see the max jackpot on the casinos on my way home from work. Really is very tempting.

Also when you already experienced winning a significant sum, it adds fuel to the temptation of gambling again. Knowing that there is really a chance to win since you have experienced it yourself.