The high-end market is mostly gamers, which is 95%+ Windows.
If they ever pull shit with Steam, are proven to have mishandled my data as part of the telemetry bullshit (well, the stuff I couldn't disable, because I spent half an hour trying to turn off all the various settings I could), or ever force Windows into a subscription model, I'm done with gaming on Windows for good and I'll suffer through the Linux gaming experience.
Hopefully by that point there will be enough weight behind it to make switching an easy choice.