I'm running a Pally + 4xShammy team with the intention of taking all professions

I've been looking at Engineering (which I dropped on my main for BS and JC),
and I just don't see the benefits of taking it up again.

Can anyone think of any particularly good reasons for taking Engineering as a 5-boxer?

And before anyone points out that there're 11 professions, Tailoring and Alchemy are relegated to my secondary team.