But again, you're not really considering the camp cost increasing per character in camp.

I might have 1,000 camp supplies, but 8 party at camp. That's only 10 LRs. That's not a super abundance. And what if you add mercenaries, which I believe was mentioned they were going to do? Add 2 more, or 4 more. Suddenly, 1,000 isn't so huge a number.

It's like mercs in Pathfinder. You don't have to buy them. They get more expensive as you level up, but if it's important to you the game gives you enough to have them.