Unfortunately, there is a group of young developers that hype up their applications, release them to the community and then they disappear. Off hand I can think of a few applications that this has happened with:

Disco, Appzapper, iClip and Menuet.

Ah, don't forget 'My Dream App', what has become of all those applications? Absolutely Nothing! These develpers don't even update thier website for these app's.

I am disappointed that I have fallen for these schemes one too many times. These developers take our money and move on to the next big app they can swindle us into buying.

I am going to be more careful when purchasing new applications in the future.