EDIT: @stephan (this was directed at you, but I think you just ignored it for some reason.)
it sounds like bad business practice because you don't know the numbers.
In statistics relating to business, you constantly take surveys on how much a person is willing to pay for a product and then you factor in price and costs and several other factors to determine the price which will make you the most money.
Right now, what makes them the most money is attachment. ie: software sales; Peoplecan't buy software without the hardware.
The price, in history, that consistently sells the most units is around 150-250$
At the moment, one of the biggest factors in their equation is cost. But when costs come down they can adapt the equation and find a new price point that makes the most money. This will invariably be a price cut.
EDIT: i do agree it will probably be a 50$ cut sometime next year, after ffxiii is released because they can make an awesome ps3 bundle and custom case and make some cash with that, then drop price 2-3 months later for christmas.
EDIT2: What some people are forgetting is that sony is losing 10-20% (too lazy to look it up) of the sales because of currency rates. So really, they are still losing close to 100$ per console.