How much does Charisma effect vendor prices?
 

I know that generally speaking, a higher charisma means merchants will buy your items for more, and sell for less. But I was wondering, how much of a difference does it actually make?

For example, if I have 100 Charisma then sell an item to a vendor for 10pp. Roughly how much more would that same item sell for, if I had 200 Charisma, instead of 100?

Does anyone have any idea?

I think once the merchant cons indifferent to you and you have above something like 100 charisma it won't make a difference so additional charisma is useless. But I'm pretty sure the wiki has something more extensive

After 104 charisma it basically stops helping at all. Before that, I think there’s a big break point at something like 76 CHA but I can’t find the reference.

https://wiki.project1999.com/Vendor

For everyday transactions, the effect of charisma with an indifferent merchant is too small to care about for me. Eg with a halfling with 50 cha I sell peridots for 9.3pp instead of the max of 9.524pp.

max sale price of peridot (vendor faction indiff or better, cha 104 or better) is 9.880, not 9.524. For your example that's a loss of ~ 60p per 1000pp of stuff you sell. Not huge, but not irrelevant either.

There's only a few breakpoints I think at 76, 91, 104 and that's it. All they do is let you get closer to max price at lower factions sooner.

My notes:
Vendor Charisma breakpoint: 76, 104, 132

I believe that’s at indifferent.