Admittedly, I don't understand the business reasons for publishing/continuing-to-publish a comic. I just know that comics that consistently tell interesting stories that have a pretty plausible beginning-middle-and-end usually do well. Whether this is what determines if a book sells well these days, I don't know.
All I do know is we've had Pseudo-Flight (volumes 2 & 3), Omega Flight (truncated before it could go where it is was going), and volume 4 (Heather-goes-beserk; Parliament Hill goes bye-bye).
Somebody has got to have a storyline that is at least as interesting.