It's interesting the public perception.
The NZRU has said they have no issues dealing with Nasser. They find negotiations to be completely straight forward. He says what the client wants and follows through with what he agrees on.
Quade due to profile has more offers than other equal players. As a result, like anybody with more offers, he takes more time to make a final decision. Nobody has ever suggested he has done anything untoward like make an agreement verbally, then pull out and ask for more money.
Both of these men are despised due to their conduct during contract negotiations.
Bernard Foley and Will Genia both agreed to terms with different Super Rugby teams, then reneged on their deals (Genia then did the same to an Aviva Premiership team also). Nobody has ever questioned their character, or the conduct of their managers.
Funny perceptions. Apparently it's better to quickly agree, then renegethan it is to take your time and follow through on the agreement you actually make.