De85 on 13 March 2008
Enough to make a profit. Since different games have different development costs it varies. For example, Killzone 2 has been estimated as having a 30 million dollar production budget. At 60 dollars per copy, every copy sold beyond a half a million represents profit. If it sells more, which it most likely will given the hype, then you can count on seeing a Killzone 3.
