Vendors choose what capabilities they create and sell literally all day every day.
You should read that sentence as
> Additionally, even if there is a guild - no guild ever let a vendor pick and choose what [the guild's] capabilities were, that would be insanely dumb.
You should read that sentence as
> Additionally, even if there is a guild - no guild ever let a vendor pick and choose what [the guild's] capabilities were, that would be insanely dumb.