Oftentimes I'll get an email from some company's list for which the sender's address is noreply@____.com. I'm sure there's an email marketing expert out there who thinks this makes perfect sense. It's not coming from a person, so don't pretend it's coming from a person, and don't let people think they can reply to the email or they'll be disappointed. Great reasoning.
Except that I don't want an email that's not from a person. There's a good chance I don't want an email that is from a person, either, but you telling me that I can't reply if I want to isn't going to make me more receptive to your marketing message. Subtly, or perhaps not so subtly, you're sending me the message that you don't care about what I have to say, you only care about what you have to say.
And if that's the case, why would I want to give you my money?