It's funny you bring this up. I had the same problems with lowering the values on my cash, skips and scrap parts. It's taken me hours and I don't know why it does that but I was eventually able to get it to stick. I tried many different things (raise the value, lower, erase, change) but in short when you do your search on the loading screen, you must have 2 results to edit. If you only get your currency once and edit, it will change back to the old value as soon as you spend or receive cash. Keep restarting and searching, I sometimes do the search before killing the game and restarting (without editing), idk if that helped. I also closed the game and GameGuardian and started over. I did this over and over again until my results gave me 2 numbers to edit.