making it hard to say goodbye

Some time ago I was looking for organizations that facilitate self-publishing - one of which was AuthorHouse. Today I got a nice polite email asking if I was still interested in their services. Nothing wrong with that, good business practice I would say. However, I do not need their services, so clicked on the link at the bottom of the email ...

... which took me to a web page that asked me to enter my email address ...
... which returned this message:
Hello ... if I hadn't received an email from you how have I arrived at this form on this web page? I didn't bother clicking on the 'contact us' link - I'll just delete future emails [unless they read this, of course]