Depends on the meaning of "should" there - if you mean according to the laws of capitalist society, then no, they shouldn't: they should be paid what it costs t

Depends on the meaning of "should" there - if you mean according to the laws of capitalist society, then no, they shouldn't: they should be paid what it costs to feed and clothe them in all cases, and the rest (surplus value) should be used to expand production through capital investment (including productivity-enhancing machinery etc) or hiring on more people. (Skills and so on complicate the picture.) If "should" means "in an ideal world", however, Marx and his followers would argue that the whole point is to enable people not to work so bloody hard anyway, so the question does not arise.