There are several reasons for that. First, employee don't want less money and fake it. Employers want the employee to be on site because they paid for it. Sec

There are several reasons for that. First, employee don't want less money and fake it. Employers want the employee to be on site because they paid for it. Second, society praises people for working. You will look better if say you are busy. Third, our systems would collapse if people were actually paid to their real value. You would see the total unfairness of it, and also how truly brilliant or useless people are. Fourth, laws, syndicates, medias and logistics come in the way. And with a big inertia. Fifth, humans are not rational and don't do "the right thing" according to the intellectual or displayed objectives. And they have all their own agenda.