Upgraded 1 lvl10 wall and 2 lvl11 walls today (8mil total resources)
Capped DE and I can only spend it in 2 days 😦 Upgrading BK makes no sense because it is as good as DE and time wasted. People sometimes say its better to overlap heroes in expense of AQ, but actually a level of AQ is worth far more than 10 levels of BK at any range. 15/40 is much stronger than 30/30 for example and it is usually considered by most farmers that a level of BK is a level wasted unless AQ is maxed.
Upgraded a WT to lvl9 today, not sure its going to make any difference to my defensive power though.