R&C titles have never really been frontloaded that much, so far as I know. They simply sell well over an extended period, and generally rack up decent enough sales.
Between RFOM, R2 and the R&C releases Insomniac have seen very steady and nice income since PS3 launched, and their model is clearly built around more regular, lower cost releases vs spending years targeting a huge best seller.
Try to be reasonable... its easier than you think...