At least they're using the correct word. "please advice" makes no sense.

I sometimes use it when I'm actually looking for guidance/advice from the other person.. maybe I shouldn't.

Yeah, I find it's a part of that middle-management corporate-speak social-engineering language. I think the only way to deal with it is to give as good as you get. If they say "please advise", you counter with "managing expectations". Or something - you can usually just make it up.