Either way, not having a digital comics site — or having one but not putting any effort into it — seems like a missed opportunity to bring in some extra income. (goodereader.com)
That's how all the major comics sites work — comiXology, Comics Plus, and the e-book stores such as Kindle and Nook. (goodereader.com)
Sellfy (web) Sellfy is another PDF sales option like Gumroad that I've seen many comic sites using. (zenotelos.com)