Of course this wouldn't be needed if account sales were banned.
People would still hack accounts with or without signatures and campaigns, but the demand for them would be significantly decreased if we removed signatures from ranks (or banned them completely but that's something theymos doesn't seem willing to do), as accounts would practically become worthless as 99% of their value comes from their earning potential via signatures. However, I think people would still hack/sell/buy older accounts to try scam with though, but it would hardly be worth the effort for most I reckon.