Because i only use apps that work reliably 100% of the time, and there are more than a few bionic users out there that skype doesn't work for.
Also, I mentioned the fact that I'm not huge fan of skype on PC's.
And I contribute a hell of alot to these forums and don't spam post. This is a very valid question and seeing as how I have very little experience with video calling, I wanted to get users opinions before I delved into it.
And if google is developing a video chat function to compete with "facetime", I'd much rather support that so they further development on it.