How important is EMD on first offer of MLS listing on rehab home?

[Trevor S Foster]

Ive been debating with one real estate agent that I work with. I'm new to real estate investing and he just got his license. 

He's been adamant about having a copy of EMD check sent with each offer.

I'm on the other side of it where I don't think it's as important with an initial offer on a fix and flip home.

What are your thoughts on this? 

Should we be sending a EMD with every single offer?

FYI he isn't saying we need to write a different check and make a copy. Just one copy of a 500-1000 check for EMD to send with a offer.