I'll buy the fuck out of Digital Comics if I have some reasonable assurance that I'll get to keep those files forever. I feel super, super hesitant on buying any digital media with DRM these days, even from major players. I do buy a few TV shows, but I internally rationalize that it's roughly equivalent to a cable subscription (which I don't have) and in the meantime, those particular digital purchases act sort of like a DVR.
I bought one movie and its sitting in the menu list, taunting me, telling me that I'll never have access to it in a few years time. Not doing that again.