So essentially, you're saying that 'mac' sucks, and then you tell us how you copied your Ubuntu installation to look and feel like OS X.

Um .. okay. Carry on then.

Sillyness aside. Linux distributions (like Ubuntu, Debian, CentOS, etc) and OS X have more differences than you think. OS X is based on a BSD code base, while Linux is an independent development of a unix-like system. This means that these systems are similar, but not binary compatible.
Linux is more like a cousin of OS X than a brother, if you will.

Furthermore, OS X has lots of applications that are not open source and are build on libraries that are not open source. It's debatable whether this is a good thing or not. Clearly if you're in favour of free and open source software then it's not ideal. But the quality, stability and (most importantly) availability(!) of applications on OS X compared to applications on Linux (whichever distro) is simply much, much higher.

I run OS X, Ubuntu, RHEL and Win7, by the way.


p.s.
"to buy os x it cost just as much as windows"
http://www.apple.com/osx/
$19.99 from the Mac App Store.
Oh, and an OS X 10.6 upgrade was $10 a while back.