The spammer conundrum

How come spammers are bright enough to figure out how to send several million e-mails, harvest email addresses and set up money laundering schemes but they frequently make themselves look like even bigger complete idiots with laughably poor grammar?

From example just received:

eBay sent this message to you because you have a reclamation that you have take the money from a client and we think that you are a big scammer.

(I sent this message to you because you think this will be a big laugh. I think you have take this message and are having big laugh too, no?)