why?
When Android is a prefectly good platform, and Samsung are making great use of?
I'm assuming they had already spent a boatload of cash reinventing the wheel before they got to grips with Android, so they figured, "why not"....
It's a shame they didn't make it so that Bada sat ontop of Android, so you can run either Android or Bada apps.... That would have been a smarter move (although perhaps against Android terms of service).
Either way, I think Bada (and Ovi) is pretty much doomed to fall my the Android Marketplace wayside.