I think a big part of why we're losing so much is a. There's simply not enough players, and there will be even less since the week is about to start. and b. nobody knows how cities work so they assume a planet that's already a quarter invaded is hopeless so they look for somewhere else to dive so they can make a difference rather than liberate the cities to save it.
I don't think AH has once explained how the fuck cities work. Their fetish for not giving the playerbase any fucking information or stats is ridiculous at this point. I had to browse these threads to even learn how cities work, or that you could change ammo types on weapons.