
Raiding camps are something you make for food, if anything.
You make the flat money buildings and then something to hide them. That’s it. If you have lots of money or need food you toss a food building in there and then maybe the other hiding building if you think it might be at risk.
You go:
Warp-token stash (1k to make, 200 gold per turn) Already the best economic return on investment in the game (other than maybe the Skaven weapon pile, but that takes a slot that matters someplace and doesn’t scale that well). Like if you do nothing else, you’re basically in Gold Mine territory.
Upgrade that to Warp Token Mint (3k to make, 400 gold per turn). Pays for itself in 10 turns. Actually less because it starts paying for itself immediately (W-TS is 1 turn, iirc).
If you think it might be in danger, you toss a Deeper Tunnels (2k) Now no one can ever find it. Discoverability is zero.
If you need food you can toss some food buildings in there and then Murder Holes and Kill-Perches (though now you’re making less, but such is the trade off). Or just make other Undercities that make food (or raid, take prisoners, Raiding Stash, etc, etc).
Mineshafts run until they’ve populated the area with free undercities, which are also just Deeper Tunnels/Warp Token Mints, then you sell the Mineshaft and toss whatever in there, or nothing. Either way.
But remember the base set up for “random town in the middle of nowhere worth nothing” is 6k over multiple turns for 400 gold. Which seems pricey, but is on par with Mariemburg’s ports, which are the best money building in the game to the best of my knowledge (or close to it if nothing else). And unlike Mariemburg’s ports, you don’t have to drop 6 at once, it’s like 3k, then 3k again.
Now this might impact food generation, but you can also just not make money and make food. Or make both if you have the cash. You’ll come out ahead 1 food and 200 gold if you just cram all the things into an undercity (Mint, +3 food, both detectability structures). Which isn’t amazing, but it has literally no upkeep. It basically will never be destroyed by anything and will generate income and food forever.
Also you reach a point where food is meaningless anyway. I pulled up a save to look at undercities and I’m currently generating +36 food. And that’s with 36 settlements and 8 undercities. My undercities are mostly in Big Money places like KAK, Lothern and Drakenhof, because I’ve conquered all my old undercity areas (including Mariemburg and Altdorf). This is a mid-gamish save even where I stopped caring iirc.
YMMV and all that, but 6k to generate 400 gold a turn in a place you don’t have to defend is a good return. It doesn’t cost you building slots, you don’t have to guard it, it just sits off someplace and makes you stuff.