Yes, It Does Have an Effect
Believe it or not, they are very annoyed by these PPRuNe threads, because it affects and impedes their efforts to recruit a new group of suckers who are seduced by the web site, the fancy offices and the slick charm of the CEO. These threads cause some applicants to not apply, some to decline interviews and some to decline job offers, when choosing between Prestige Jet and a reputable company.
Although the CEO doesn't care what anybody thinks, publicizing the name, complicity and actions of the Chairman, Hamed Al Hamed, does have some effect because of the culture of face-saving and hiding bad deeds behind subordinate lackeys; this is an unwanted embarrassment for Hamed, among his peers, demonstrating that he cannot keep his underlings under control.
By itself, a PPRuNe thread may have little discernible effect. But as part of a multi-pronged effort, enough pressure can be exerted in order to induce the company to pay its employees and those with court judgments, in order to quiet the landscape - until the next batch arrives at this point and does likewise.
We know it works because in February 2010 the company was ordered to pay up 3-4 months of salaries which were in arrears, and the CEO complains bitterly about the effect this is having on his relationship with Hamed.