Think about how many Letsrun posters are actually faster than 6:00 per mile.
Then think about the percentage of Letsrun posters who wear flats for a marathon.
Now think about the likely response you'll get to your question.
Now ask yourself whether it was worth asking your question at all. You have no new information, your initial guess was confirmed but not supported by any reasoning that's not just common sense, and you're probably not going to buy any of the shoes people reccomend.
"Hey guys! I am not a 4 minute miler but I'd like to be one. Is that okay?"
"I'm not either but yeah, go for it, if you run good you can do it."
"Okay thank you! Bye! I'm a looser!"