Way better security model
Unified error handling
Clean install/uninstall (no rot)
Much faster and more capable version of XAML running on top of DirectComposition with easy DirectX interop
Native support for web apps
Resolution independence with no extra work
Easier to support accessibility tools like screen readers
Saner API design (no flags where only some combinations are valid)
.Net Native
Much better touch support
Cross-platform (xbox, holo lens, IoT, phone...)
Access to devices like camera, mic, sensors with high-level APIs (even accessible through C#/JS)
No P/Invoke required for C#
You move and now make $120k and your expenses double to $80k. You're saving $40k; twice as much. But in reality, not all of your expenses increase that much, and the other benefits (bonuses, matching, raises, interest, etc.) are % based, so the discrepancy increases quickly.