Isn't there a recognised ratio between highest and lowest paid, either in a country or a company, in order to promote good feeling? I can't rememeber what it is, or what it's called.
Comparing levels of work is almost meaningless anyway. I work physically hard, in all weathers, collecting recycling, often dirty and a bit smelly. I probably get paid less than someone answering the phones in a call centre, or a sales person, who gets to sit indoors in a comfortable office. I might say (with obvious bias, of course) that I can do without call centres, but most of them wouldn't want to do without having their rubbish collected. They might differ. In any case, I know I'm far happier doing my job, than I would be answering phones and trying to make sales all day.
My boss used to do our job with us, plus the management of our part of the project. I didn't even fancy that extra bit of work, and now he does less of our job and project manages the whole charity. I definitely wouldn't want that job, for all the extra money he gets.
Yes, the managing director will always get more than the factory floor worker. But without the factory floor worker, there'd be nothing for the managing director to manage....