Hypothetical scenario:
You can bet on a single dye roll (choosing a number between 1-6), but if you win you get paid x12 of your stake (instead of x6).
So the Expected Value is positive (see example below), but you'd still have 83% chance of losing.
1 - will you take that bet?
Definitely I would take this bet, since the winning % is double of what it should be normally, and you can't find that in any gambling site. However your chances isn't that high to win but still the profit looks really interesting if you predict it well. I would say anyone would take the bet if he/she have the money to put it in.
2 - if so, what % of your available funds would you put at stake (i.e. funds you're willing to gamble and afford to lose)?
~snip~
I would consider putting 10% of my available funds into this bet as a one-time opportunity that may not present itself again. While I understand there are risks involved, I view it as a good and unique experience and will not regret the outcome, regardless of whether it is positive or negative.