Professional people willing to fork out so much for a pro computer (and so much more than what they would have paid for at the competition) for their work that allows for out of the box interface with the most common network protocol on the planet in corporate, university, small business or conference settings (or for that matter on
any occasion where ethernet comes very handy as quick ad hoc networking between computers, router set ups, places with poor wifi reception etc. etc.) dongle and hassle free? I would say about 70-80% and I am being modest here.
What's the retina to do with anything anyway? This is a completely bs non point. All the more so if this is a first gen retina computer it should be a millimeter thicker to allow for better thermals from the gpu to drive it.
The things you read to justify ANYTHING apple does, reminds me of the old joke that if apple come out with a pile of crap and call it the iturd and slap a $2000 on it, sure enough you are going to find quite a few people coming here and saying that it's ushering in a new era of human computer interaction, or how iconic the design is, or that competitors products are **** anyway at least apple are being upfront about it.