> If you are stock-rich and you can buy stuff on the collateral for that: normal people can't really do that. Ordinary people have a much harder time buying more stuff than they have the cash for. Or at least on worse terms when they do take out a loan. Being rich is cheaper than being poor. Is it really so awful to change that?

What you are talking about is reputation and it will always be a part of the dynamic. It happens at the poverty level too. In any poor community there are people you trust and people you don't.