Old days comics kind of supporting all supporting characters

Comics it seems will be cashing in on major selling characters. Remember the old days where everywhere are selling Superman and Batman comics and in all kind of stories? As compare with today's stories, the old days those stories are kind of lame. Perhaps during those time the style of storyline are the in thing. No one dies. And all those supporting characters will be there as well, support the story. At least now in today's comics, you don't see the same supporting character all the time. They have many more others before the character get stale. Still, if there is enough demand from readers, you will get Jimmy Olsen in all the Superman books. That will be kind of stale but it was kind of retro style if it do happens.