I quit the game. I had saved my progress but I realise now that the entire code wasn't being highlighted when I copied and pasted. My last working code was from Karma 1. Oh well.
I played again after many years. I have discovered that the maximum price for an item is 1.0 e300.
I was going to play until I had used all 12 creatures, hoping that I could play the "whole new game within the game."
But reading the other comments, I realise that you just meant that each new creature is the whole new game.
I think I will stop here with 6 Karma, 3000 Red Dwarfs and 152 PP waiting to be collected.
Still a great incremental clicker :)