You have a completely neutral coin. How much money would you be willing to bet with someone on a flip of it?
Not worth it.
How about a 100 sided dice where you have numbers 1-51 and they have 52-100?
How about a 100 sided dice where you have numbers 1-75 and they have 76-100?
1 buy-in if I could only do it once. I'd run it an infinite number of times if it were repeatable.
How about a 100 sided dice where you have numbers 1-49 and they have 50-100?
No
How about playing Russian Roulette. How many chambers must the gun have for you to be willing to pull the trigger for the following: $1000. $10000. $100000. $1000000. Whatever your net worth is (that is you double your net worth or die from the bullet).
Not pulling the trigger.