Here is a very telling interview with Klien about his negotiations with Sauber and Renault (in German).
Q: Why did no race seat worked out for you during the recent negotiations?
Klien: Because compared to other drivers I obviously can not offer the overall package of speed and experience, geographic market value and economic components, such as sponsoring partners.
It is no secret that the "business factor" of a driver in the current economic situation is a huge competitive element. But that is not to say that Pedro de la Rosa and Vitaly Petrov are also excellent drivers, for example.
Q: How close were you tuned to the two mentioned cockpits at Sauber and Renault?
Klien: One has only to look to when each driver pairing was announced. Sauber was my first point, I've been at the factory in Hinwil for two years as test and reserve driver.
Peter Sauber has always been completely open and gave me no illusions regarding the economic components. I appreciate it very much. He waited until the last moment for the driver decision.
I was on Renault's driver short list until 24 hours before the announcement. You could really talk about a last-minute decision here. The second driver was not fixed until the morning of the car reveal. The decision was obviously not easy for the team.