Why is Wall Street (finance) susceptible to this in particular? Is it just because they hold high value information? Part of it is the rampant principal/agent

Why is Wall Street (finance) susceptible to this in particular? Is it just because they hold high value information? Part of it is the rampant principal/agent issues all over the financial sector. Take, for example, the example in the article of the bond trader who sent a client a photo of the firm's current positions, in an effort to gain business. I very much doubt the firm wanted its confidential trading data shared with outsiders. I very much doubt that it was in the public interest for this one customer to have access to sensitive information that other customers lacked. But from the perspective of the bond salesman, it was a winning move, because it landed him a sale (and the accompanying commission).