I'm pretty sure that the bet amount on your head is based on your best time on that current choosed track compared to all the other players on the lobby. Could be wrong but to me this seems the most reliable conclusion based on all the hours of playing this mind-blowing arcade racer.
I mean the time done on online multiplayer race, not singleplayer etc. timeattack, hardcore and sh*t.
There is a post some time ago from Phenom stating that the position is based on last 5 races performance (if my memory is correct). However this does not stack up in practice. I assume there is some glitch in the way it works and that Evo will sort it out at sometime.
A real daft question sorry
If you bank your winnings what then ? How do you access the winnings and what do they get used for
The winnings are just extra XP. If you don't press square to roll the pot on to the next race, they just get added to your XP total then and there.