Honestly, the Linux desktop war has been won by Debian/Ubuntu. I know of no casual Linux desktop user who's not on Ubuntu, or a Debian version that's sufficient

Honestly, the Linux desktop war has been won by Debian/Ubuntu. I know of no casual Linux desktop user who's not on Ubuntu, or a Debian version that's sufficiently close. Packaging for Ubuntu first and having a tarball that any other use can play around with to get running is fine for most commercial software's needs. Chances are if you're running Slackware, Gentoo, Nix, or other non-mainstream Linux distros you'd be hard pressed to use commercial software anyway.