While we may find the high profile cases featured on Retraction Watch mainly in high impact journals, that's precisely because unscrupulous people deem these journals worth it to cheat to get into. Nobody cheats to get their paper into the International Journal of Architecture, Engineering and Nursing Science - because it and it's ilk are utter pieces of crap that will accept anything, up to and including randomly-generated text and pro-Sri-Lanka-highly-racist-UFO-conspiracies (real example). Teaching laypeople to avoid these is a very good idea.