This actually came up a season or 2 ago and was discussed by the admin team. The prevailing consensus seemed to be that it was not a major issue, would be close to impossible to police, and also that treasury (bank) money is part of a teams overall health. That said I think most of us were of the opinion that we would prefer that people don't abuse their bank, but the hassle of enforcing an actual ruling outweighed the benefits. For what it's worth I kind of self police my teams, would hope other coaches do the same. Don't be a dick is probably a good guiding principle.