RoseLegion: I can even understand that for an indie studio *sometimes* theres some resource or technical barrier to getting multi platform content out in a timely manner, but that doesn't prevent communication. It'd be nice to be kept up to speed on what is going on and why.
Disregarding people after you sell them something, well it's sad folks still treat each other in such ways (let alone can make a profit by doing it.)
I contacted the devs early this year, in order to know if there was any chance we'd get the DLC on GOG. They explicitly said "no", without giving any detailed explanation as to why. It's likely that the DLC is heavily tied to steamworks or online playing, but that is mere speculation from me.
Browsing the steam forums it also gives the impression that the devs are a bit incompetent or just don't bloody care, as there are users complaining of unfixed bugs for several years.