Population (and arguably land claimed) is, in my opinion, a far better proxy of an alliance's "power" than how many times one or two of their members can sell their alts one clay for 1 million gold.
A lot of the other statistics represent time in game as much as they do anything else. (Such as the technology score.)
I think it's possible that a ranking option based on cumulative attack and/or defense scores would be interesting. (Yes, attack scores are based largely on dedication to NPC hunting, but it gives some relative measure of military strength and/or experience.)
I don't think an alliance ranking based on players' overall scores would add useful information. But I'm interested in hearing what other people think.