I'd believe your 2% number for MacBook Air users. I'm less sure about MacBook Pro. Among other groups, the MBP is very popular with professional photographers. When you've got tens of gigabytes from a shoot that you want to move from your laptop to your file server, or whatever else, no 802.11n WiFi will come close to the speed of wired GigE. Okay, maybe 802.11ac, but Apple hasn't adopted that yet.