Well actually, maybe removing them may be a bit much? I do think the spawn shop was kinda bogus.
What if there were weapon shops. They wouldn't sell RPG-7s or miniguns, but for a fair amount of coin you could buy a shiny assault rifle. There'd be like 2 or 3, with a shopkeeper bot, maybe some guards... But the VIPs would get like 25% off of their purchases. More points for more purchases.
If you are going to have military bases, perhaps consider a bunch of smaller bases, rather than one huge one and then a bunch of tiny outposts. If I recall correctly, there were two military installations: one with a bunch of tents and temporary looking buildings, one that was more of an outpost.
If you're using old-school bots, it would be pretty cool as well to see some civilian, military and police bots. Civilians just run around and scream, but police will defend them and military will actively seek out zombies.