@ragtime Yeah, I also thought about it, and maybe it indeed works like it, but the causality would be at least partially broken in some cases, such as this. Let's say the MC would have had no such skill in this particular case. Would the old man have paid the regular market price, despite his desperate plea and explanation of needing to maintain his honour? That would be totally weird, and the MC would have likely rejected it or at least said his good byes with his middle finger upon leaving, never to come back. However, considering the old man's gentlemanly demeanour, there's no chance he would have only paid the regular market price when someone was saving his face in the nick of time. So, he would have paid extra, and about 30% seems reasonable. Any less and it would be meaningless considering his story and that they weren't exactly talking about the price of a good horse here. In any case, even if he had offered less than +30%, along with the skill, it should have been more than just +30%. So, what did the MC's +30% skill do? It did what the old man would have done anyway, so it affected nothing. This is what I'm talking about.
Granted, if you really,
really want to say it did it, then it would mean it's overwriting any normal bonus he might get. Funnily enough it would then also work in reverse: If someone was really thankful and would willingly pay the MC 50% extra, the skill would lower it to 30%. That would be funny.