Scarlet Spider had some popularity but not enough to sustain the book. I have my ideas about why it didn't catch:
1. Kaine was not very sympathetic or relatable. He didn't evoke empathy or emotional identification from the reader. From the little I have gathered about the book, the authors were going for a detached tone in the book. Comedic rather than dramatic. Action rather than intimacy. From what I've seen a superhero comic needs to have a mixture of ALL these things to keep readers hooked. He was a sympathetic character in Spider-man and he had some popularity as a hero within the tone of the Spidey franchise. Perhaps a new book with a different tone would work.
2. "All of the Power, None of the Responsibility" A good hook for the first issue, but the premise kind of locked the authors into a course that was hard to change. Also, to me, "All of the Power, None of the Responsibility" might affect the way readers would respond to the "hero."
3. I started a thread "How To Make a Peter Clone/Gwen Clone Relationship Successful" which in part addresses Kaine and this issue. I would appreciate any ideas members might have to possibly start up a NEW Kaine comic. You are cordially invited to come to this thread and discuss how to make another Scarlet Spider comic work.