Why do cheap amplifiers list such huge wattage numbers?

Inexpensive amps frequently advertise large 'peak' or 'max' wattage that the unit cannot sustain. Verified-purchase reviewers repeatedly note that real-world output is a fraction of the box number. Look for CTA-2006 (CEA-2006) certified RMS ratings where available, since that standard defines power under a consistent, comparable test condition.