Its worth pointing out that as I said in my OP that Yoshi P seemed to suggest this is something they would consider and was doable. Because of the work involved I doubt they would create such a feature and then make people pay extra for it. Something like this would be a major feature and selling point. I would also expect that any lost revenue from people getting rid of payed retainers would be offset by people buying Mogstation glamours they could now store in a log. If people getting ride of payed retainers was a concern I doubt they would be increasing our inventory next expansion.