OK, I give you a fantasy example.
I sell my ROOS in EU only.
A forum member ask to sell it in CONUS
I say ok, wating payment and then send the watch
Customs control the package and block the watch.
The buyer, 99,99%, try to be (partially or totally) refounded.
Or
I sell my ROOS in EU only.
A forum member ask to sell it in CONUS
I ignore the pm, I sell the watch in EU (no customs problems) and we are all happy
To be clear, I'm not saying that you can't ask something, I simply saying that you haven't to expect a response if you ask something that isn't contemplated in the sale thread
imho