Wot?
I've never heard of anything like that. As a workaround, water-farming and mass-producing chems are excellent ways to grind out caps.
Were you previously wearing some charisma boosting clothing that you're no longer wearing?
Those prices sound to me like 10 Charisma prices.
with 1 cha (and no other influences such as barter mags etc)
buy price for ammo should be
.38 3.35caps (4caps)
10mm 6.7caps (7caps)
.50 13.4caps (14caps)
so sounds about right? if you have a couple of barter mags the 4,6,12 would be spot on
Honestly it sounds to me like you were experiencing a glitch and are no longer experiencing it, assuming that there's even a glitch involved. With 1 charisma, prices definitely shouldn't have been that low. I don't mean to sound patronizing or anything like that, but are you -sure- that you weren't wearing some charisma boosting clothing?