This is one of the biggest challenges of many leagues and I have seen new players as well as seasoned players and leaders abuse the LC. A robust log with possibly cumulative totals of resources sent and received would be a big help as Surya suggested. Deleted logs are a often a problem and we often do not know if the system deleted them or another player. The league city is a great concept if used properly and I think it is a great tool for team building. Please at least expand the logs and give us the opportunity to enforce the rules of our leagues effectively.