My idea is that there is an automatic weekly search tool (in admin hands), to find and delete all "empty" decks, which means that these are over full 24 hours empty of each counter (0 Collection/ 0 Wishlist/ 0 Tradelist)
In this way I hope it holds your capacity more lower and the community have less "dead decks" in the libary.
A Win-Win for all of us, I hope.
But I don't know how compelx it is.. =/
The idea comes, because I saw at the moment such dead decks.. I don't know how or why someone add something and leave it.. =(
But if it is 0/0/0 no one need it now and if someone need it, they have to add it new.