If you think you have a spam problem, take pity on the UK's worst-spammed man.
I have an email address which I've been using for quite some time. In one of my former jobs, this was used as my contact address for posts on a Very Big Web Site - one of the top 20 visited-sites in the world.
As you can imagine, this email address gets more spam than all of my other ones put together. But compared to the man who is, apparently, the most-spammed person in the UK, my woes are nothing.
This poor individual, who is a customer of anti-spam service ClearMyMail, apparently gets some 44,001 on average per day. That's over 16 million spam messages per year. The mind boggles. Even assuming that each message is short, that's a collosal waste of bandwidth.
And that begs the question of why spammers actually bother. Surely, in this day and age, no one actually responds to spam emails? Sadly, the answer to that lies in the numbers: if even 0.0001% of the millions of emails you send out get responded to, you'll still make a tidy profit. For the unscrupulous, the business model of spam still makes sense.