[tritium]

  Hardly anyone uses wired ethernet...

Au contraire! Anyone familiar with wi-fi security knows better than to trust the flimsy authentication protocols, and even flimsier application layer implemntation of the user interfaces that control and behave as lock and key for the (more difficult to crack) actual encryption that protects the traffic itself.

Wireless communication is often attacked at the joints, by targeting the login handshakes that relay the password-oriented auth tokens back and forth, when confirming access. These side channel attacks on encryption are more likely to succeed than trying to capture a terabyte of traffic, in order to crack the encryption itself.

Anyone tasked with the technical aspects of handling millions of dollars securely, is likely to be avoidant of wi-fi for some select activities, where convenience is not the priority. If you know you're a spear phishing target, there are certain things you don't do over wi-fi.