And that makes sense. If you spacebank with two companies, what happens if both match it up to someone? They don't communicate with each other.
Not sure if VRI has what's called a "request first," like Interval does. You could put in a request with VRI without depositing your week if they have that system, and if you don't get what you want, deposit it with RCI. But basically, with very, very few exceptions, once it's in RCI's clutches, it's gone.