The idea isn't terrible, but as Lyam mentioned it would probably be used more for people deep renting eq, or for people who are not playing who have nice eq (not exactly the same as deep renters) so they don't lose their shinies.
Honestly, I think the benefits of having a few deep renters deadbeat a lot of shinies outweighs the casual player who forgets about the game and loses their so so eq. It's not that I want to punish casual players, but I just don't want people deep renting limited eq to get a heads up when they need to log and get some cash.