In Casino, the games of chance are also games of -EV. Now imagine that you could play a simple dice with the following payout table, but the play is limited to one round:
4-6: pay back 10:1
2-3: no effect
1: lose your bet.
How much would you bet?
How often can I play?Everything!
You would? Quote the gambler (although it's EV optimal of course). I would go with 50% which is already far above what the average person would wager.