More records of people baiting Nigerian scammers: http://419eater.com/html/letters.htm . People on http://www.419eater.com/ lead these “4-1-9” scammers on wild goose chases deliberately to waste their time, in the hopes of distracting them from attacking other people and also just having fun.
I also wonder how many of those initiating the scams are actually the vicious, heartless criminals that the site insists they are - for example, one of the exchanges [1] results in the scammer sending about 9 hours of (ostensibly) himself reading Hitchiker's Guide To The Galaxy on the promise of earning some money for it. Career criminal, or having trouble finding work? Of course, some are genuinely dangerous people but it seems to me that there is probably a spectrum.
As I said, I'm not trying to defend those who seek to profit at the expense of others, but the level of grandstanding present on that site leaves me thinking that some of the counter-scammers themselves are doing exactly that.
[1] www.419eater.com/html/booked.htm