Sony invested more money into R&D for the PS2. about a billion dollars (this includes factories, machines, employees, construction and R&D for PS2). As for MS, not as much as Sony After all, MS used current technology. They just slimmed down a PC.
But here\'s the irony : the investment that Sony put into the PS2, including the factories....has paid itself off!
PS2 is now in the black making profits! It costs them less to make a PS2 since they make their own parts!
MS...though they spent less into Xbox R&D, is in the red. Parts are being bought from other companies and assembled in Mexico and Europe (the ones I know of).