Agents often have really good relations with clubs. A good agent can't bring 3 top youngsters to your academy every season. If as a club you have a lot to offer then agents will help rather than hinder the move.
Some clubs have a name for being a nightmare to negotiate with and if you have 5 offers your not going to wrestle with the nightmare club.
But let's be honest if Sanchez had the choice of us and Bayern his agent would be pushing for Bayern because its the best move for the player. While a club like Liverpool and spurs are seen as an ideal development stepping stone between lower clubs and top clubs. They have no chance at all of getting Sanchez.
