Multiple accounts on same device is not bannable.
iDevices are meant to be single user devices, they were never intended or even considered, the need to change gamecenter accounts. Because of that, problems can and do occur that is outside of Supercell's control.
No one will stop you from having multiple accounts on the same device, but you do so at your own risk. If problems occur, you may not receive the support required to fix the problem.
Having a defenceless war base won't get you banned but...
- It's a stupid idea
- You will find it difficult to farm resources
- People will frown upon you in clan wars
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