They can afford that because of the license fee savings for not using windows.
The geek has been running this tired old nag around the track since 1995. It was a bullshit argument then and it is a bullshit argument now.
The price of the mass market OEM system install is and always has been a trivial part of the expense of owning a home PC. There will be the monthly bills for broadband services, the expense of consumables like ink and paper...
It's less confusing to have one os (all linux) than two (linux in the office, windows at home.
The home user has different needs and values than the office worker --- to say nothing of the office manager. These markets began to diverge as early as the introduction of the Apple II and with the introduction of Windows 95, the divide had become a chasm as broad as the Grand Canyon.
The home market is a tough nut to crack - and it isn't just about the games.
The 4K monitor at a mass market prices implies the sale of 4K HDTVs and 4K HD videos --- HEVC encoded ---- at a mass market price.