As the author of vcdtoolsX, I have to say I like this development too. Mac osX is like a bridge between UNIX-stability and the MacOS nice user interface. And that is also what theese GUI's are. Bridges.
I made vcdtoolsX couse I wanted to use the power in GNU vcdImager in an easy and friendly way. And then people starting pushing me to release it. And so I did. Of course as Open Source (hurray!).
There still are alot of nice unix apps out there that needs GUI's. MySQL is a bitch to start/stop and admin. And no GUI have yet made that one easy.