Thank you for your post vinylweatherman. I noticed too that 2/5$ buy-in tournaments are a better bang for the buck so in principle it is possible there are tournaments with more than 100% return but they are rare.
About the play time allocated, I got disconnected once while there was 1 minute play time left. I connected again and noticed that the timer had reset to 5 minutes left and I still had all my winnings from before the disconnection. So I got this free ride once because of disconnection. I admit I tried to manually disconnect later to see if I can repeat this but it didn't work anymore
I wish there was some strategy involved instead of just hitting spin. The only strategy now is whether it is worth it to use the continue play options. Why is the result calculated from win box only and not total balance (win box + unused credits), it would lead to more strategic play.