I can understand locking accounts, since it's all automated, and they probably get a ton of bogus stuff programmatically submitted all the time. That said, as soon as someone has over a thousand dollars in your warehouse or over a $1000 pending payment to them, it should get shunted to a person for review and resolution. At that point it's obviously not some automatically submitted account and form, and what's more it's likely to quickly escalate to legal action against Amazon (regardless of what their contracts say, getting Amazon lawyers to respond is expensive, so they should want to avoid that).