either way its not a big deal. heck id be happy with something in the game manual that says 'be wary of trades around this time'.... at least its out there.
It can be a very big deal if you listed your player with the view that he will be sold at a time when a lot of users will be on (like 2-3k users)but due to server maintenance, the player instead goes at a time when there are very few uers on (400-500 users)
Unless you delay the lot by 24 hours, teams are gonna be peeved