It doesn't get a pay check. It doesn't get tired. I can go all night. It doesn't make stupid mistakes.
Machines work everyday putting out the same quality of product. Humans can vary everyday with there mood and they could have 3 different shifts come in doing different quality too. Plus when holidays come the humans are off work when the machines are sometimes still running with a skeleton crew operating them. Humans are also more expensive because of wages and benefits and lawsuits when things dont go well for them.
Jennifer forgot to mention: - It does not go on unauthorised leave