We simply don't consider the fact that people who started work first started with a less-oiled machine and took more personal risk. If you wanted you could, but we don't because we simply don't mind. Personally I don't believe in using the fact that I started doing something first as a reason to get a greater share of what other people produce when they start working.
It works out in the end. Sure, I spent a lot of money on my tools, and some other guy is using them because he doesn't have his own. But if he sticks with it he'll end up buying his own tools, and I'll use them sometimes, and eventually he'll have an apprentice of his own who will use his tools. Not to mention, having someone to help is a lot better than not having anyone.
It's ultimately up to the workers at each specific firm to decide exactly how to handle these things. One firm could decide that initial-risk-takers deserve a bigger cut, others could decide not to. The group consensus is what matters most.
