As for Greed, don't think so. It's more about cost of the product and what people are willing to buy/pay too. The PS2 is a very inexpensive console that gives those middle class and lower class families still something to play, a choice. Not to mention it is very common knowledge that Sony has or was giving away the PS3 for like the first 2 years at a loss per console to consumers.
Some from a business stand point, something has to make up for something else that's taking a hit. It's been a give or take and we, the consumer have been blessed at both ends of the situation. Sony has taken the loss for us that have either console. I for one have never had an issue just flipping the on power switch to either console if I wanted to ever play a game. Not a big deal.
First point would be correct as cheaper ways are always found down the production road.