Often they do that in a shadow economy -- a place where employers may offer them less than the minimum wage or make them work overtime withoutextrapay.
The ideal situation is one in which they can inspect merchandise in person, and then buy it at the cheapest price without having to schlep it to and from the car, and without having to payextra for delivery.
It began in December 1967 when five secretaries at a ventilation and heating company volunteered to work an extra half hour each day withoutpay to do their bit for the flagging economy.
With some well-aimed pitches to restaurant chefs and choosy home cooks around the country willing to payextra to get meat raised without growth hormones and antibiotics.
With first hand experience I can say without doubt that most sellers are not at all happy about having to payextra fees to put their properties on the market and for some the extra cost has been the "last straw" causing them to decide against marketing.