Ya, they liked the concept so much they copied it. They sold a $100 Wi-fi adapter, proprietary HD and proprietary flash memory? The lower end model was just a means to have a cheaper price point, not a Trojan horse to sell to gamers so they can ultimately pay more in MS branded add-ons. Sony originally announced the $499 version without HDMI, but ultimately left it in.
And yes the 20GB model did not have Wi-Fi, but very few of these models actually existed.
Now playing: TLoU PS4
Recently Finished: Watch Dogs, Southpark: Stick of Truth, Infamous: SS
PSN & XBL: Scuzzlebutt33