Is this result above average?

I recently started going to a game at my college. $.10/$.20 NLHE, $10 buy-in for first three hours, $20 after that. There were 9 guys total. After 8 hours, I had $300 in front of me. They were all really bad, and kept rebuying because they felt that I was just lucky.

In most of you all's experience, is this normal? Poker is my hobby, I study it like a chess player studies his game. How often do you hear of players getting a five-fold return on their buy-in? Was I just incredibely lucky, or can I expect returns like this on average?