(Decanter) - Too many Bordeaux chateau owners rely on negociants and prestige, warns Philippe Magrez. Too many Bordeaux chateaux 'don't know how to sell' wine and several estates are being hampered by disputes among members of their owning families, says Philippe Magrez. Speaking to Decanter.com in London this week, Magrez said that Bordeaux chateaux are storing up problems in an increasingly competitive world wine market, because they remain too removed from the sales process.