FWIW: I'd be willing to pay a reasonable amount for an ad-free unbranded version if it came to that. It's a great little app, and the developer deserves somthing for his/her efforts. But only if they don't junk it up with a lot of feature bloat.
If they go the "full featured" route then I'd hope they'll keep a basic version that "just plays everything" - and skip the album art, play lists, and all the other nonsense that has muddied up just about every media player out there. That's why I dumped Winamp, RealPlayer, Quicktime, MediaMonkey, Musicmatch Jukebox...the list goes on and on and on...
Not everybody wants to run their entire life out of their media player. The beauty of KMedia Player is that it's small, fast, and plays things without a hassle. I hope they don't lose sight of that.