These are some ideas I put in another forum, but I figured I'd make a suggestions & ideas thread.

In addition to the current victory rewards, here are some changes that I think would add incentive for hitting tougher bases:
1. A (very) small chance of winning badges while attacking base, say .1% per base level per hit.
2. A credit reward for each hit.
3. Higher XP rewards for hitting.
4. A small chance per hit to salvage artifacts. Higher level bases could reward more powerful (and more rare) artifacts.

i could be wrong, but i think Dan already has something on the way for extra incentives to hitting the higher lvl bases