Supply Ctgd

I'm about to start my first solo delve, coriolis the great dark. I was reading on pg217 "how much supply to bring?". It says 30 to 60 supply points. That costs 3000-6000 and for solo thats 3-6 inventory slots. Add to that the Garuda device, deep scanner, pickaxe, climbing pick, book of glyphs, a couple of weapons ( the basic gear) that's another 7 slots. So 10-13 inventory slots. Now max inventory slots for a solo player is 12 (if you invest 6 points in strength, and not everyone wants to do that) +2 if you buy a large back pack. Am i missing something? Where do you get the money and do you make a profit from the delve? How do you manage your inventory, did you have any problems? I want to be clear i love every component of the game mechanics, i'm not advocating to get rid of anything. Supply, inventory slots and all the rest i like it. It just seems to me unbalanced or maybe i'm missing something. What's your opinion about it? Did you find you need way less supply? Did you make more than 3000-6000 per delve? For now i'm thinking to fix it by making so that supply is given for free by the explorer guild and i have a porter NPC that doesn't do anything but carry stuff. I don't like it and hope you guys have better solutions.