I have bought about 14-15 disk PS3 games to date. And spent about $300 on the PSN. Someone I know (the crazy gamer kind) has spent between $4K-5K on games alone. I don't know what your friends are trying to showcase, but I would say if they don't have a use for the PS3, they were idiots to buy it in the first place.
The PS3 has sold consoles in the millions (the last number I heard somewhere was between 18-21 million). And I, neither those other millions I am sure, have any plans of throwing it out for the next 4-5 years at least. Guess what we will be doing with the PS3 then. Interesting statistic btw, the PS3 is selling more than the 360 did at the same point in its lifetime.