I know it happens in real life with Team Bosses who are well semi friendly with each other.
In iGP i suggest it start small with managers betting on the finishing positions of their drivers.
Like a Podium, top 15 etc.
It wont cost much like 50k maybe to get in and the pot goes to the closest winner at the end of each race.
I think this adds another level of excitment for the managers, if anything gets them interacting a bit more.
If betting among managers is frowned appon then the other idea is to bet against the system.
I\'m Gonna Win this race HAL! wanna Bet on it?
HAL: Sure thing dave, if you win I\'ll add 2m to your iGP account.
Dave: and If i loose?
HAL: Assembly cost will be raised 2% or something like that w/e