Replacable covers

Might be a good idea. Even Alt covers also.

Are you talking about alternate Dust Jackets for books or am I completely misinterpreting what your saying?

Yes. But both the original fakku jackets and alt versions.

I like it and am all for it, of it is a possibility for us to get some secondary jackets I hope management will take it under advisement.

Hmm, I'm not sure that'd be as easy as it sounds. The printer takes care of the folding process and makes sure they're on the cover of the book. This helps them retain their shape and makes sure it's flush to the book. They print and seal them for us and then we ship them out.

It's not quite as easy as it seems to fold the dust jackets, and I can't imagine shipping a folded one and it retaining its shape or not getting damaged.

id be down for those, also solid white slip jackets, or black. something to make it a little less flagrant so you don't feel weird when carrying a doujin in your bag

Did it many times. Gonna do them again for the vanilla essence kick starter. When you have a sharp knife and you scratch the cover it nice to have a way of replacing your mistake. More of a indent crease. The trick is the inner flaps. Just pre-scoring the flaps is the easiest. Then it can be shipped flat and it would be easy to refold where the bend is. Even if the pre-scored option isn't possible then the user can just lay out the book in the center and gently bend one side to see if it's center, then crease. A simple matting bone/burnishing bone or bone folder. Even a blunt rounded stick or stylus would work.

I've heard more people complaining about the difficulty of creasing the jackets from Project-H than compliments about it to be honest.

Fakku has their printing done right - their quality beats out every other publisher (both Manga and Hentai) that I've ever experienced with only Japanese publishers coming close. While Project-H has improved, their work and their covers still fall short of Fakku. I look forward to their "enhanced" editions of Yamatogawa's works and will be ecstatic if they come close to Fakku quality, but I don't look forward to having to manually fold and apply the dust jackets myself.

I doubt it is worth it to Fakku to try and publish the dust jackets separately - I simply don't think the demand for replacement jackets would justify the setup and production costs. An alternate jacket might be more worth it, but really where would I store the unused jacket? Double layering could affect the fold lines and create extra rubbing on the the jackets risking wear... and storing anywhere else also risks creases and messing up fold lines. Personally I'm happy with (and prefer) alternate art being printed directly on the cover with the main art on the dust jacket.

However I'm not completely discounting your suggestions - a privacy jacket for transit in your bag or for those daring enough to read in public (you risk obscenity laws in some more prudish locations) is not a bad idea. Though I would say go all Fakku red with the logo in the corner in white. Not boring like white, not an obvious cover-up like black, and more applicable to the company so it is more worth creating.