That's one thing I find interesting about hedge funds and (some, not all) finance organizations: their ability to make huge amounts of money with small staffs. IIRC RenTech's revenue per employee is something entirely absurd, in the millions.
It's just leverage. You can leverage people, capital, technology. Many companies were built leveraging large numbers of people. Many companies leverage technology. Many companies leverage capital. Gotta lever up.
Yep, they don't have products they need to maintain. Just enough infra to figure out the next profitable trade. Once heir models stop being ahead the curve, they can be just scrapped.