Banks are pointless on iClassic , reason being is you don't loose gralats in your imaginary wallets they stay intact unlike the old graalonline system where players use to loose gralats whenever they were killed. Also a trade system would be a waste there would be alot of scams.
What i suggest is a auction system since clearly many people ask me tons of times when I'm online if they can re-sell there hats. But making a auction for USED item would be deducted by 20% on the system by default there's no way someone can earn back 100% profit that they spent. Not saying this would or would not happen but clearly it's something in another direction towards a bank/trade system.