If you are in business, I'm going to guess you want folks to be able to reach you. So, make it easy for folks to find you.
Just today, I wanted to email someone. I went to her website. I did not see an "email me" button. So, then I found her profile hoping I'd be able to find a way to reach her there. Nope, she had her email address hidden. It just wasn't important enough for me to keep trying to reach her.
Just so you know, the person I was trying to reach is in business and does have something for sale. While I was not trying to email her about a purchase, my not being able to reach made establishing a relationship not an option. Having a visible email address leads to communication. Communication leads to relationships. Relationships lead to sales.
Look at your website. Look at your blog. Look at your profiles. Are you easy to reach? If someone wanted to email you, how much effort would it be on their part?