There's a sucker born every 12,500,000 emails

I can believe this given how gullible relatives forward out obviously-false chain emails all the time.  There's a fine line between that behaviour and responding to these.

Spam gets 1 response per 12,500,000 emails | News | TechRadar UK

A new study details how spammers – the bane of our email inboxes – still make pots of money, despite only receiving a response to one in every 12,500,000 emails they spam out.

The study, by a team of seven computer scientists from University of California, Berkeley and UC, San Diego (UCSD) infiltrated the Storm network, which uses hijacked home PCs to relay much of the junk email you spend your days wading through while wondering 'who the hell responds to this stuff?'

Well. Now you know. One gullible idiot in 12,500,000 recipients. Or thereabouts.