I don't buy that mate, it seems for all intents and purposes he argues over an additional £1mil transfer fee so why would he sanction such wages? Seems to me the other guy (whose name completely escapes me but he was the one who negotiated the Joel Campbell transfer very badly) and Ivan negotiate contracts and wages with players once we have agreed a fee.
Wenger might well be involved in identifying the players he wants and who gets contract renewals but i cant see him negotiating wages
However, where he is responsible is his complete misuse and mismanagement of players. Players like Squillachi, Arshavin, Park and Chamakh were all outstanding in other teams and internationally for that matter yet they are shite for us? Look at Bendtner a player of undoubted ability who cant function for us, Walcott? Vela the list goes on.