What is binding the technicians to stay at "just above median salary"? Why wouldn't they be able to negotiate? If they can generate so much profit by employing

What is binding the technicians to stay at "just above median salary"? Why wouldn't they be able to negotiate? If they can generate so much profit by employing capital, why can't they go to another financier and start their own companies? This is not some philosophical puzzle of pirates sharing a treasury. There are tons of other choices for everyone involved, and none of them have to lead to such extreme concentration.