They are not. But some low paid jobs exist only because they are interesting to certain demographics and some people are willing to pay for it; think about the paper boys or lawn mowing adolescents - it is the kind of thing I can do myself (I find it relaxing), but I pay for it only because it gives someone else the opportunity to have some extra pocket money easily. It is a good arrangement with your kids or some neighborhood kids and in rural areas in my country (Europe) it is sometimes an arrangement also for a nanny. In many cases the money I pay is more than the value I receive, but I still choose to pay. If someone feels the need to pay $40 for 3 hours for a nanny that is fine, but that does not make it automatically worth $40.