LOL at thinking you were 1st.
Every winner gets "1st" in a DON, I was about to post that when I saw your followup post. If you were actually 1st in chips >50% of the time then I think you'd be one of the top players.
pokerstars is the only site I know with Fifty50's. I don't like them, I'd much rather play a DON where the variance is lower and profitability is higher. Chance of collusion is also higher, but honestly that's largely overblown especially in 6-max games where collusion is easier to spot. After thousands of games and thousands of dollars withdrawn I'm quite comfortable with the risk. If I could play on Stars again I'd forego the Fifty50's and just play regular SNGs instead.