8) If you do the event, I think "free a slave with gold" should have a "Yeah I'm good" or a "Lost it all" version. The good one could offer themself for fun, and the bad one could offer themself for "More help". Just a thought.
To fix the bulk selling strat now all you'd have to do is increase the price based on their submission stat. IDK how you got it scaled right now, but if you just made people train the submission stat before selling lvl 0 could be 50% normal price +10% per level. Training submission is actually the easiest to train right now, so it would make sense to lock the price to it.
Just some added thoughts, again, your game, and it's a great concept. The only execution flaw is it's so new there isn't really anything to keep you playing. Thanks for making a great game.