This could work well especially in lieu of coding the other races. Leading players would think twice about haphazardly buying items that may fall into other team's hands and it would give the losing team an extra push. It would also allow inexperienced players the opportunity to become familiar with items they may otherwise not know to buy.
Then again, it has the potential to make the losing team's attempts all the more futile in supplying the winning team's lower tier players and make the winning team stronger at the expense of the losing team.