Curbishley was particularly annoyed by the sale of George McCartney and Anton Ferdinand before the close of the transfer window, and said it had amounted to "a breach of trust and confidence" giving him "no option but to leave."
Ferdinand and McCartney were sold to Sunderland for about £8m and £6m respectively, but Joorabchian described the fees as "tough numbers to reject."
Joorabchian, who helped West Ham sign Argentine duo Carlos Tevez and Javier Mascherano, said the club had to trim the wage bill and sell players before bringing in new recruits.
Curbishley, who spent 15 years in charge of Charlton before joining the Hammers, signed the likes of Freddie Ljungberg, Kieron Dyer and Craig Bellamy, but injuries meant the trio featured only sporadically.
Ljungberg joined the Hammers for a fee approaching £3m, but received a significant sum to end his contract after just one year of a lucrative four-year deal.
Joorabchian said Curbishley and former chairman Eggert Magnusson were both culpable.
"I think from the day he (Curbishley) entered the club, he made most of the decisions with regard to the incomings of Luis Boa Morte, Nigel Quashie and Dyer and Ljungberg," he said.
I wasn't deeply involved at that time but it was pretty clear-cut that he was very much involved in those.
"I think the board realised that there were a lot of mistakes made during that period when Mr Magnusson was in charge.
"Not to put blame on either of them, but the salaries that were being given and the players that were being brought in were probably not the board's idea of taking the club forward."
Towards the end of last season West Ham had a wage bill approaching £50m a year, which left the board, according to Joorabchian, with a "difficult task" to buy new players.
"Your wage structure has to be able to cope with the players coming in, and if you have a lot of players on your books with high salaries, who are probably not very productive on a day-to-day basis," he said.
"Your first stage is to release some of that wage structure to get into the transfer market again.
I think it's very sad what happened to West Ham in the last year, with the players and the direction which they went.
"I do feel for him (Curbishley) because he's a manager who has resigned under pressure, but, unfortunately, the game has become so competitive that I think every manager understands that there are three major issues.
"You have to succeed in the transfer window; you have to make sure you have a winning side; and - when you're at a club like West Ham - you have to play good football."
Joorabchian said the new injection of cash into clubs like Manchester City would make the Premier League more competitive.
City's new owners the Abu Dhabi United Group (ADUG) have promised to make the Eastlands club "bigger than both Real Madrid and Manchester United".
But Joorabchian warned against adopting a continental approach of appointing sporting directors to take control of transfer matters, citing Man Utd and Arsenal as examples of clubs being run successfully by strong managers.
"The success of Man Utd has been basically based around the managerial decisions that have been made," he said.
"If you do bring in a sporting director, advisor or consultant they have to support the manager. It has to be a team. They have to be behind the manager."
source : bbcnews
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