I would think that 419 scammers are using as much technology as they need to do their deed. Their penetration through antispam measures is probably higher compared to botnet spam because there is always a human behind the creation of each message. The various contents they include and the services they abuse add many vectors to defend against.
We have also seen these fraud messages from Dilbert.com ourselves:
http://www.sophos.com/blogs/sophoslabs/post/5633
Of course, Dilbert.com is just another service they are abusing. Other services, such as Yahoo! Calendar invites, has been abused for a number of years now.
Savio Lau - SophosLabs
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