If you mean a PS3 game because they no longer make Playstation game it will depend on whether you mean the complete development marketing and distributions It also about man hours and not people. Games can take from 10 to hundreds of thousands of Man hours. Black Ops II might be as much as a million Man Hours to get everything ready for the November 2012 release. In order to have annual releases Activision has both Treyarch and Infinity Ward developing Call of Duty series games and for both releases they have other companies help with the game development
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It depends on which PlayStation it is (1, 2, 3 or the portable one) plus the cost of each game.
Playstation does not call the internet service "Live" that is a Xbox user term. The Playstation Network or PSN allows most games to be played in a multiplayer with or against other individual on the Playstation Network. There is also the new Playstation Home that includes other people and is much more than a single video game
Game prices always depend on the game, but the Playstation Store prices are not often below retail.
Almost as much as if you did not trade in a PS2
Why not let Sony make PS4 1st, then after that discuss 5.