Is 11% earning $500k for at least one year really that surprising? For example, a mom and pop small business selling their store in order to retire could qualif

Is 11% earning $500k for at least one year really that surprising? For example, a mom and pop small business selling their store in order to retire could qualify for one year, but that money would likely be the bulk of their retirement savings. It's probably not a useful metric though, if most of those people break $500k due to one-off lump sum payments.