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That wouldn't prevent them to build a social network around you, just like Facebook does ("ghost profiles" or whatever they are called these days). Those emails are just spam.

I too was looking for that button, and the best that I could find was drumroll to create a LinkedIn account and change my preferences. :/

For the end user that isn't a member, they seem to not want to let you opt out of their emails.

Would be nice if Gmail's "Spam" button actually blocked future emails from that same person indefinitely!

Sometimes they get around filters by sending from different emails, that's really annoying. I should probably quit Gmail and go back to Cerberus which has awesome filtering!