When both Ghostbusters and Turtles figures came out in the late 80s, early 90s they were the most popular things on the shelves by far. The Ghostbusters line was gigantic and had tons and tons of merch and tie ins everywhere to go along with the Real Ghostbusters cartoon. Now granted it's not as relevant anymore but in the 80s the GB toy lines were just as big money makers as Transformers and Turtles easily.
what? The turtles toys were the highest sellers this past summer, they couldn't keep them on the shelves. The current cartoon is huge and quite good. It's already been greenlit for a 3rd (20+episodes each) season and they haven't finished the first.