I never said Sony was being generous either. This is just the reality for the market for these games and well Sony's strategy is definitely not helping. The way they have handled some of theses series is very poor, to the extent they managed to get Insomniac themselves to move away from them after making PlayStation games exclusively for 15 years.
They didn't "move away from them" because of pricing games low, before they just had no reason to develop for other platforms because the PS1 and PS2 dominated sales so they stuck with making their popular franchises with Sony. Near the end of the PS3 gen they started making their own IPs and continued to develop the R&C they make with Sony. It has nothing to do with pricing.