It seems like you're better off in the long run if you upgrade your resource production as much as possible, before you start building your army. Is it OK to just upgrade my hiding place all the way, and not even worry about defense while I keep upgrading resource production, so that if people attack me they won't get any resources from me? The hiding place upgrades are super cheap. Does getting attacked hurt me in any way, if all my resources are in my hiding place?