Thanks, Eevee - I think that's the question I'm really getting at; Is there a realistic situation where KC is on the board, but you decide to Money despite it's presence?
Boring boards mostly- Province games with no attacks or +buy, especially those with good Treasures, are the best situations for skipping it. Strategies like Fool's Gold rushes, or Masquerade-BM don't need a KC. It's pretty rare that I skip King's Court, but it does happen. (Unlike, say, Goons, which I will go for almost no matter what.)
As for skipping Sea Hag, the biggest thing to look out for is good trashing. Masquerade and Lookout are especially potent here, since top-decking the curse means they can zap it immediately. Also, Ambassador, which is better at passing out junk than the Hag, and Chapel/Remake are both often strong enough to deal with the curses too.
Farmland: the canonical price point is $9, actually. Play $6, and Farmland a Gold into a Province. There are other uses, too, Farmland is a card I actually avoid fairly frequently but it's something you usually should keep in mind while greening.
Hunting Party: Generally only one silver and only one gold if your early-game hands allow you to get away with that. The best terminals to go with a focused HP stack are those which give you things like cash and +buy, and attacks are good too. Card draw isn't, because it can cause unwanted reshuffles. Things like Militia, Baron, Mountebank, Goons are golden here (though if there are Villages too you'll probably want to build up to multi-Goons); I'm sure you'll be able to figure out more. And of course, sometimes HP can be part of a larger engine- but the stack is a good place to start.
Menagerie: Trashing is key, especially copper trashing. Buying a wider variety of cards helps, though you want to make sure the cards have some other function in your deck too. Cards that let you sift, or discard for a benefit, are especially potent in Menagerie decks- Hamlet and Warehouse are the gold standard, because they offer more control and don't require extra +Actions.