I had like 50,000 with my first valve (I had to run to town for something and I left the game running, lol), and I bought the second valve, which is listed at 10,000. It for some reason seemed to take like, most of my money, not just 10,000. I also did not realize my upgrades apparently don't carry over? But also, they stay as expensive as they were from my first valve? Is it supposed to work like that? I also couldn't go back to my first valve.
Otherwise, cool incremental game! Have a wonderful day and good luck in the Jam!