Because 7 8 9.
Because they don't do Windows
Eric Clapton would never let a small bag of cocaine fall out of a window.
Because 7 ate 9.
Because they can't compete with an invisible power that actually exists
Astro-knots.
Hey Microsoft, why is there no Windows 9? You've given us 7 and 8, and now you're skipping straight to 10?" "Well, to be completely honest, 7 8 9."