So, kind of related to this.
If I have 6 personalities in play and Growing Hostility has already resolved, does Prosperous Village enter play for free or 1 gold?
Growing Hostility
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
So, kind of related to this.
If I have 6 personalities in play and Growing Hostility has already resolved, does Prosperous Village enter play for free or 1 gold?
In this particular case, you will still be able to buy Prosperous Village for free.
Growing Hostility gives the Gold Cost stat to a minimum of 1, but Prosperous Village's trait isn't modifying the stat, but rather giving you a temporary discount to it's entering play cost.
As defined here, the use of "Cost" versus "cost" is what allows Prosperous Village's trait to reduce it's entering play cost below the minimum Gold Cost imposed on it by Growing Hostility.