Although Ferrari blames Max.
http://www.autosport.com/news/report.php/id/80013
"In reality the steady trickle of desertion is more the result of a war against the big car manufacturers by those who managed the sport, than the effects of the economical that affected Formula 1 over the last years," it read.
There is also another quite nasty remark.
""Formula 1 continues losing important parts: over the last 12 months Honda, BMW, Bridgestone and this morning Toyota announced their retirements. In exchange, if one could call it that, Manor, Lotus [because of the team of Colin Chapman, Jim Clark and Ayrton Senna, to name a few, there is hardly more than the name], USF1 and Campos Meta arrived."