***Would someone please enlighten me - what is the rationale behind making platform-exclusive games? Isn't it logical to think that they'd make more money did they release the game for multiple platforms? Or do they just expect that everyone has every console out there plus a PC?***
Yeah, Sony benefit solely from the game if it's popular.
Sony make money from the sale of the game, sale of the licence and sale of the consoles... if it's _really_ popular then it'll encourage the sale of more of their consoles thereby acting as a multiplier of their other games.
The developers get lower cost of coding benefits and they'll be paid a kickback from Sony for being exclusive.
The end users get no real benefit.