I have noticed (since the time that I asked the question) that I can't use someone else's contact button unless I'm logged in. If I'm logged out, it just gives me a page that offers to let me sign in / sign up. I'm experimenting with putting a link right to my contact info in the text of my description, but I can see that I'm going have to use the email option if new customers are going to be able to use it. It's nice that email is an option, and that you can just link to it.
By the way, I love the option to use links easily in the text! I try not to over-use it, but I like to have certain kinds of information available to customers, and it makes the pages much more versatile.