There are many ways to do this. Even with a real-world currency system like PSN, you can still introduce points for loyalty management.
A full-blown points currency system however is usually used to maintain a float to make extra $$$ for the vendor. Without getting into the mechanics, what people are saying is: Microsoft has a separate marketing budget to discount point values to market their XBL platform. This is separate from promoting games.
On PSN, Sony's main focus is to sell and promote the games and movies. There is little barrier to PSN since it's free to begin with (No need to promote it separately). Hence, the marketing dollars would be spent on discounting the content or even give them away for free.
The actual end user benefit will depend on the size of the marketing budget. e.g., How deep a discount is. When the time is right, they may (both) introduce a loyalty system.
A full-blown points currency system however is usually used to maintain a float to make extra $$$ for the vendor. Without getting into the mechanics, what people are saying is: Microsoft has a separate marketing budget to discount point values to market their XBL platform. This is separate from promoting games.
On PSN, Sony's main focus is to sell and promote the games and movies. There is little barrier to PSN since it's free to begin with (No need to promote it separately). Hence, the marketing dollars would be spent on discounting the content or even give them away for free.
The actual end user benefit will depend on the size of the marketing budget. e.g., How deep a discount is. When the time is right, they may (both) introduce a loyalty system.