I pick up machines now and then for not too much money. Usually there is something wrong with them. I spend quite a bit of time fixing them, putting money into some of them. Bobbin winders, cords, felts, bobbins, disks, feet, foot controls, etc don't always come with a machine, need to be replaced or repaired. Sometimes it the tension or the machine is all stuck and doesn't turn. I do sell the machines for more than any $20 but I have time and money in them. At least a person doesn't have to take them to a shop to have them serviced right away.