what defines “mainstream” in comics depends on what 1-2 year period you wish to discuss apparently… EQ was “indy”, then was published by Marvels “EPIC” imprint for some time, thus by some peoples criteria that made it “Mainstream”, then moved elsewhere etc etc… just as an example. What used to be “indy” or “small press” in some cases became “mainstream” over time, if they were more successful. Or in order to be considered “mainstream”, did it require a CCA stamp? or just Marvel/DC on the cover? shrug
I say hang the sense of it, and just read what you like, theres plenty for every body.
