My experience from RCI is much different than Interval. Interval was an easy systemand you often were able to trade with in a fair amount of wait time.
I was once told that Disney canceled their contract from Interval because they were not interested in charging people extra money, they were an exchange co.. RCI took on the contract allowing people to deposit their week and they keep a portion for trade and try to sell the others for disney to make $$ back for Disney & RCI. Not sure if this is the truth just what I have been told. It seems possible to me.