We're making wild guesses about the pay scales there. I've worked at places where employees make 30,000 and the boss makes 35,000.

Also, the bonus system sounds like it was based heavily on quantity, where it is believable that one automated system could substantially out-perform the sum of the other employees. In a system designed to split a bonus more normally (say 10% for 10 employees) it's not hard to imagine that in the scenario described it could have gone 90% for 1, and 10% split among 9.