Sneaker counterfeiters generally don't care all that much about pass authentication checks. For shoes, and most clothing, they care more about time to market (getting their fake out before or near release date) and price point. If someone is wearing fake shoes, unless they're outlandishly fake (there were some hot pink fake yeezys I've seen more than one), you mostly likely won't be able to spot these imperfections from a distance. Also, unless you're in the niche you probably won't care if they're real or fake. I'd liken this to hanging prints of famous paintings; people like the look but might not want to shell out for a Picasso.

I work with shoes on a daily basis and have done/do auth checks.