I don't remember who told me, that I was supposed to leave one account for the bet and another to earn the income,
That's the simple solution if you want to separate balances so you don't accidentally gamble them. There's really no point us making complex changes when the same result can be so easily achieved already.
Problem is... if you have two or more accounts, you might be flagged for "Alt cheating" and both accounts might be blocked. Yes, there are steps to be taken to report both accounts... but I am not going to take that change, when I have loads of bitcoin being stored on my account to earn interest. (That 4%+)
I would rather want something to be implemented ..like a "Vault" option for the "investment" feature... so that the balance in the "Vault" would be protected from accidental gambling.