I'm going to bump this topic and try to get more people aware of this concept. I think a lot of people wouldn't mind being able to post images on their novel but, when and if Tapas actually provides a better source to do it, this is the best/only way to to get illustrations up.
Not only that but I also feel if that if more people are aware of this and commit to it, it may also lead to more attention given to novels. People can focus not only on illustrations, but things like cover pages, characters and any number of things to make their novel stand out.
I myself know that if I saw more novels with illustrations, I too would get more invested. This site is ultimately a place for comics, a place for drawings. If the drawings behind the comic is what interests the majority of readers on here, then perhaps doing something similar would also bring more attention to the novel side.