But they don't generally share in the bad times. If a company has a bad year most people don't take a pay cut. And they definitely won't get paid nothing for a year while lending money to the company!!!
For example you own a local garage. On normal years to make $500,000. Your costs are $400,000. One year thing go bad and you only make $300,000. In most cases the owner will borrow the money to cover the difference. Maybe someone is let go but in most cases the owner tries to retain the staff hoping next year is back to normal. Maybe the owner will use his own money rather than borrow. In any case they will find the money somehow or close. And remember this is at the same time as having your salary reduced to $0!
Eventually the owner wants to recoup and protect themselves from any bad year. But at a $100,000 profit a year, and remember this is pre tax, and profits are double taxed for the owner, then how long will it take to save pay them back and save enough for the next bad year?
So if one year he make $600,000, or double the profits, he needs to keep those profits for the bad years.
Now big corporations are slightly different but at the same time they need to be absorb harder years. So right now they squeezing profits but at some point those profits will be needed for a bad year. Or perhaps it was to pay for the recent bad years in which they may have acquire debt...
Some corporations are greedy, but a lot aren't. You have to look at the multi year picture when it comes to profit sharing. And most employees are not willing to loan money to a corporation in a bad year like the owners will most likely have to ;)