Trades until locked should be influenced by Gossip / Reputation

If this suggestion were implemented, not only would having a good reputation net you discounts, but it would also increase how many trades you can make with a villager before he stops selling to you.

Similarly, if you have a bad reputation with a Villager because you injured him or one of his neighbors, not only do his prices for you go up, but the number of things he will sell to you per day goes down.