Who advertises to those with empty Inboxes?

I just cleared out all the messages from an e-mail account I seldom use. It's mostly used to provide an e-mail address when I'd really just as soon not provide one, and mostly accumulates spam. After clearing it out, I re-checked the in-box to be sure it was empty. It was, but the empty spot contained 3 ads -- all for lonelyhearts services. Asian women look for men - Women from Philippines, Thailand, and other asian countries   Single in Chicago? - Meet quality Singles in Chicago Parties, Trips and Introductions. eHarmony® Online Dating - Looking for a Serious Relationship? Let eHarmony Help. Free Profile!

This makes sense, now that I think about it.