Why would you give away any details, when each one of them might end up being a secret that is causing your firm to make millions of dollars?
The financial sector is many things, it's a lubricant of the economy, it is a prediction machine, it's a fascilitator of markets, but not least important it is setup as a game, where every player tries to outsmart the others. Why would you talk about how you are playing and give your opponents a chance to outplay you?
I wish superior innovation were more responsible for the bulk of profits. Weighted by volume, in more cases it is simple market power.
(Fun fact: Statistics was invented many times throughout history. Minus the last time, it was always hidden to make someone money.)
Even when you've got awesome secrets, you've still got other parts of the business. Open research moves faster. Libraries of books have been written about investment, or running a business, or writing software, or other profitable things. Granted, some of that comes from people teaching without acting -- but a lot of it too comes from actors with serious skin in the game.
The financial sector is many things, it's a lubricant of the economy, it is a prediction machine, it's a fascilitator of markets, but not least important it is setup as a game, where every player tries to outsmart the others. Why would you talk about how you are playing and give your opponents a chance to outplay you?