CLDs caused a lower amount of people to 'actively deposit' since they were able to 'live off of' the roi weekly. AUDs seem to be doing something similar, but on a daily basis instead of weekly. After AUDs are all sold, I suspect roi will go up as more have to deposit, just as happened (I think - not sure if it's true or not) after CLDs were all eaten up and no longer going for the start price in auction...
Things may be slowing down a bit, but over time, they will go up. In the mean time, if you are too worried, I'll gladly take your clds off of you at a ped a piece.