it would be better if we can buy items straight from our bank account in the market...for example we buy this certain item in the market, we dont need to withdraw money from the bank and buy the item..as soon as we purchase the item it will automatically deduct from our bank accounts..:)

Number of reasons why that would make game mechanics TOO easy. You'd never have cash on hand for one, which is good for folks who want to attack users.

Plus the bank has a "go back" link so it's not like it's ever hard to get right back to where you were before you needed to withdraw.