A few points:
- Prizes for winning a defense battle with the AI controlling your team as very low. You basically just win rank points, instead of losing them.
- For most mortals, rank is irrelevant (I have 4k points and I’m not even close to top 10,000, much less top 1,000, which would result in a prize upgrade).
- If I lose the battle, I get the chance to get revenge. Revenge rewards are nice.
- Despite what the mail message with the revenge prizes says (ie, the mail you get is named “Defense Rewards”), you don’t get those for defending, only for getting revenge (in the PVP menu, they’re called Revenge Rewards).
So unless I’m missing something here, if you don’t plan on getting to top 1,000, having a weak team is more rewarding than having a strong one (especially after you got all Tier Rewards).
… Or am I missing something?