This is a strange logic. Your description of a job is more that of a glorified hobby.
Meanwhile, are you expecting that the relatives (if they exist at all) shoulder all the burden and costs of caring themselves?
Only because someone does not live alone doesn't mean they don't have a cost of living. Indeed, a disabled person's cost of living is likely higher than an able-bodied one. Nevertheless, they should be expected to compensate this with a lower income than everyone else?