Wtf, I've never heard of that. I guess you can look into cheating for RenPy and change the variable named money.
If it didn't exist at all, RenPy would fall back to the default value: zero. Your case is very peculiar. Do you have other saves you can load? Maybe the specific one you tried to load is corrupted. If that won't work either, then just start over I guess. There's worse things than replaying Eternum. :P