IMO, not a good idea. From a scammers perspective, in essence, you pay an entry fee so you get access to screw people over.
I've got a good rep and prefer to keep it that way. I try to keep buyers informed of what's going on, when payment arrives and when parts leave/tracking. I also try to help out with info, etc, that isn't related to sales. Being a member of the community,
I've given away countless, hundreds of dollars in parts to people for free or just pay shipping just because they asked in here. I guess I should just charge FMV and pay for a gold membership... slippery slope to me. I'd prefer to spread a little goodwill amongst the membership in the form of free parts, etc.
The kicker is, there are people that come here solely to pawn parts and don't provide anything else.
Where you draw the line on that is up to you.
I certainly hope anyone with outstanding parts issues gets them resolved. It sucks to be on the receiving end of those deals as I know all too well.