This is O.K. as long as the sound sets are created by a person (who is honest and does his own creation) putting his sound sets into the repository.I'd also like to think that one day, someone is going to be smart enough create a Korg Fisa sound repository for everyone to share their sets. <hint hint!>
I don't know how you would control what an individual is providing -- maybe he is putting some sets provided by Dale Mathis, Cory Pesaturo, or Richard Noel (or anyone else that may be selling them) in the repository. This would be very unfair to them. They have put hours & hours in creating their sets. They have to do them with the Fisa on board editor, as there is no PC editor at this time. These should not be "stolen".
In general, I don't like this idea, since a person could take Dale or Cory's sets, make some minor change and claim that it is there's. I would consider this as outright plagiarism.