I'll add one of my experiences.

I offered a fairly low value item for trade on CC with a specific request the person first post "you have mail" before contacting. I did this to ensure I could easily research who was contacting me.

Of all the requests I received, my favorite was from someone who wanted the coupon who didn't even have a FT id (this was pre board upgrade). They didn't have a clue of the T&C of the coupon, and just wanted it because they needed it for an upcoming trip. The trade offer to me was "I'll check to see what my husband has."

I guess there were a lot of lurkers sending out emails for trades and the masking of CC, IMHO, is a good thing for the community.