4 Mercedes GP 202
5 Renault 145
7 Nico Rosberg 130
8 Robert Kubica 126
9 Michael Schumacher 72
15 Vitaly Petrov 19
So if say Glock had been in a Renault, how many points would he have gotten, 70-80? Almost definatley more than that, an that would have been enough for Renault to get fourth. No question Petrov has cost Renault fourth spot, lost them millions and therefore costs more than his sponsership probably brings.
However, if Mercedes had two drivers performing at full capacity for the whole season, Renault might never have got the chance, Michaels low scoring is what made Vitalys pathetic scoring so painfull.