[Imnimo]

All of this is perfectly reasonable advice, but I think it'll fall on deaf ears. The jobs these bad emails/messages are advertising are often terrible, and while making a better pitch will let you attract the interest of better candidates, those same candidates will surely not accept the terrible job you're offering, so why bother?

[bozhidar]

I guess for the terrible jobs they'll still have the benefit of a better pitch working better with the not-so-great candidates that'd be willing to do that job. :-) Obviously there's a limit to how much a recruiter can do in such cases.