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torok said:

 PS2 sold 50M units after PS3 was released, while the PS1 sold almost 30M. As long as the device is sold for a long time, it's possible. 

With slowing sales PS1 also had to cut its price to clearence-like pricing (MSRP $49/£49) to get it's last ~13 Million sold.  

Without it's official $49/£49 price points the PS1 likely would not have crossed the 100M mark before the end.