You're right - it's probably not just for the "pros," but I don't think you have to be a "pro" to know that slapping text onto a comic cover (or whatever this was) isn't really a good thing to submit to this site. I see a lot of flyers doing this, yeah, but I'd question the judgment of any of the originators to put that stuff up on GP.
if those flyers like this - that use imagery ripped from someone else and don't have any original artistic merit - are only used to promote shows, then why keep them for posterity's sake on this site?
Curious here. Don't have a definite stance, per se.