Also Pashtshuur spikes I think should be worth a fair amount of caps. Maybe 100 cap per spike.
Really? Take a p90, a big box of JHP ammo, some antidotes and you are rich.
You encounter 2-5 of them at a time and they drop 50-90 spikes.
Thats makes 10000-45000 caps for each encounter!
The game economy is already fucked up, don't make it worse.