As in any online game, EA has to maintain its servers from time to time to fix any errors that occur. In order to minimize inconvenience for players, EA announces these maintenance tasks with a certain lead time.
You can use this maintenance work to bid on a lot of players in advance with a favorable purchase price. This is because during the maintenance no gamer can access the game and therefore cannot outbid your offers. The players simply expire during the maintenance work and then belong to the player who offered them.
EA itself recommends setting a higher minimum price for each player before the maintenance work starts so that the cards are not sold too cheaply. However, many players do not pay attention to this advice, which can be exploited by you. For this method, it is, therefore, necessary that you inform yourself about the maintenance work of the EA servers.