I think the story matters alot in a comic. I mean yeah art is important but if the story isn't good then no one would buy or read the next volume. Everyone judges a book by its cover ( I do too) and then I read the backside of it to see whats it about
If I like it I take it, if I don't ... I don't
Art is important too at some point as well I guess. no one wants to read wiggly lines right?
but then again why do you think Cyanide and Happiness is so popular? its because of the story line
But well thats my opinion on things
btw make sure it has a catchphrase that is appealing to readers or sth