They already do. See the other thread that's been bumped yesterday.It's only a matter of time before someone realises that you can sell more blades via packaging. Every year (or more often) you issue new packaging art for the same blades, forcing people to collect that edition before it sells out. The blades have to be decent enough for people to want to accumulate them, but it is the box art that drives the sales...
Imagine the above blades with Robbie the Robot and Dr Zachary Smith on the box.