True but you can have cities without ABP and DBP as I know from looking at some of the stats of the highest points players in your ally. Don't get me wrong there are good attackers and defenders with you, but even among your top ten there are people rated wayyyyy below me in dbp and abp stats. Which is pathetic since I have used over 2 months of vacation mode and went inactive for a month in this world. So three of the months I have been here I did nothing and they did not catch up on helping out there buddies in the alliance. But they took care of themselves and made more slots for more cities did they not? It seems selfish to me to demand protection and attacks for you and never give the same courtesy in return. That is the story of BP. The efficiency of bp is told by kill death ratio, since bp is equal to the amount of pop killed then you can take fighter bp of each alliance for a given month and find out who killed more troops. Factor in the fact that attacking makes you tend to lose somewhat more cities if you want but in general fighter bp plays a good tail of activity of members of an alliance. Nothing else comes close.