In Shadowlands after Blizzard decided to ban all non-max level characters from accessing BMAH, this is why character of maximum level is required. Before Shadowlands, obtaining Foam Sword Rack used to be easy: you simply had to make level 1 character on the target realm, buy gold, place bid, win the auction and Foam Sword Rack immediately became yours. Now it requires a max level character which is impossible to level from scratch on the target realm in the short time span between detecting the item and the auction's end; the only viable way is to transfer your character and hope for luck.