tjkraz I think you have it 100% right. DVC is looking at how these events pull, how much the members enjoy them, and yes how they effect sales.
I would expect another member cruise sometime in the fuure. I would expect something like member homecoming sometime in the future.
I've done both and if they do a new one and the timing is right (or we can make it work fo us) we'll be there.
Disney always does these events 1st class!
I also agree with Diane - there is much more to DVC than homecoming. Events like this are just gravy.