2% chance? It's payout 50X i suppose you are talking about dice  
Extremely unlucky in my opinion, but look at my logic:

In 400 rolls you didn't hit single time payout 50X but you should have hit it 8 times.
Possibilities:
1) you will hit it 10 times in next 100 rolls.
2) you will roll dice 400 times and you won't hit it.
3) you will roll dice 100000 times and on average you will hit it 2000 times. 98000 red bets and 2000 green bets.

Do you see how your 2% chance looks like?