Knowing how to write takes much more than 'going to school' for it - as many shitty writing degree graduates prove. But sharing that I have a B.A. in English and Writing encourages some folks to read my stuff, so there you go. I guess they assume I'll know the difference between 'your' and 'you're,' for example. And they're right.
 
Beyond that - if my writing doesn't speak for itself, so be it.