It's hard to decide about the cover, between having the No-Ghost Logo alone, the Ghostbusters, themselves alone, or the Ghostbusters with the No-Ghost Logo in the background.
They're not Superheroes. They're Slimed Heroes!

Actually, they're not just Janitors. They're Scientists. Doctors with Degrees. They eventually became
“Paranormal Janitors”, but they were still Scientists. It takes Scientists to start the Ghostbusters' business. But those Scientists can easily become
“Paranormal Janitors”.