The black bagged concept is fun, however, I'd prefer they didn't do this again. Unless they were going to seed more of these issues with a larger amount of additional variants or even one-of-a-kind covers.
I would suggest they do a transparent acetate cover where the first 3 pages is the cover and you can simply turn the page to see the inked and penciled versions (* if D.C. decides to do this please remember give me a shout out that I mentioned it, I might just have a few other ideas ;-) *). I would find this far more enticing and buy each individual book!
SpitfireINK's comments