You can definitely get a nice 2.0 system for around a 1K, but I would not say spending more is a waste. You just have to spend it wisely, I've heard (much) more expensive systems than mine, some sound better, some don't.
The disillusionment comes when guys spend way too much on cables and tweaks that don't make a difference... I auditioned some Totems yesterday and the salesman put those Beaks on the top of the speakers - I heard no difference. He even had me put my hand on the top of the cabinet, and as he put the Beaks on, said that I'll feel less vibration. The cabinet still vibrated the same amount - I thought my ears couldn't detect a difference, but my sense of touch? this is the stuff that I can't stand...