yeah pdfs (& postscript) are more for making sure everything prints exactly right...even text-only pdfs can get quite large. seems like overkill to try and read pfs on a device with smallish screen...unfortunately the format has become pretty universal and so that's where the content is.
but then again i'm amazed that people try to read things at all on mobile devices, as i much prefer to print things out. and for the few comics that i've read (preacher, transmetropolitan, 90s batman makeovers) i think digitizing them would "defeat the purpose" in a manner of speaking...
sorry but i have a lot of caffeine and opinions in my system.