By why should usury be treated unlike any other form of income? If I work in a factory and earn a $10,000 paycheck, I get taxed. If I wrote a book last year and earn a $10,000 royalty check, I get taxed. If I earn a patent a few years ago and earn $10,000 in licensing rights in a given year, I get taxed. If I buy land rights and earn $10k for extracting the oil from it, I get taxed. But if I put $10k into the system and earn back $20k, it's hands off?