Out of a million or so emails received daily through our shared email servers, lately only about 6% is legitimate email. On holidays and weekends it is much worse (around 2% legitimate!). I don't know for sure, but I imagine those signs I occasionally see on the side of some roads - "Have computer? Work from home! Earn $$$!" - has a bunch of people kicking off spam scripts during their off-hours.
Does anyone actually read the spam? If so, does anyone really respond to it? I assume so or the spammers would have stopped bothering by now.
~Brad