There are 2 reasons why i think there is no pve:
1. NPCs are buffed to max. Ridiculous high HP, high crit chance.
I can understand that but here comes second reason
2. SHITTY LOOT. Why the fuck i have to waste ammo, superstimpacks, time in turn base to loot fuckin mauser, shotgun or spear lol?
PvE is dead since november 2009 wipe
SF caravan in 2009:
Avanger minigun, LSW, Laser rifle, combat shotgun, needler pistol - YAY
SF caravan in 2012:
Where the fuck is it? Och bugged... right. Even if it was in game all you could loot was laser rifle and piece of shit LSW - SUCKS
BH caravan in 2009:
3 or 5 miniguns and lot of jhp and ap ammo - YAY
BH caravan in 2012:
Bugged? Anyone attack them? Few hunting rifles. - SUCKS
Moreover, two years ago it was possible to raid caves. That was AWESOME. But now its not possible. Almost every cave was full of npcs with BRAND NEW WEAPONS like combat shotguns, 14mm pistols, rippers, assault rifles, snipers rifles - all new, ready for use or sell.
As you can see there was sense to do pve and it was possible(and funny) in real time(caves) and in TB(encounters). Than came NERF
NERF FUN!