Sublime Text 2 is not open source and will never be included in Ubuntu or (likely) any other Linux distro. However, I will say that it is one of the very few software packages I have ever purchased. That's saying quite a bit coming from a dyed in the wool GPL guy like myself. :)
Most distro do include non-open source software, even Debian. And Ubuntu now has a 'For Purchase' tab in the Software Center, with a couple of programs already.