1. That's true
2. If you don't pay it back right away. Which you should, because you already had 300$ to spend on a ps3 anyway. Or if you only had 200, you then have 100$ balance with 29% APR, which can be paid off in the 3 months afterwards. So even if it takes a year to pay off the balance, the cost will still only be ~230$
3. If you're an idiot
4. This is doubtful, at least for now.
The reason they offer this deal is because it's a Sony card. They make a percentage off of it and they hope you will buy more Sony in the future. Company cards are there to encourage future purchases and help create a relationship between customer and business. It's also free advertising, because the owner will be looking at the card several times a day. Sony Sony Sony SOny Sony Sony Sony. Eventually it gets to you.
There are only strings attached if you're an idiot.
Case in point, rebates. A very large number of people buy with mail in rebates. I remember reading somewhere that rebate items sell at a great percentage more than other products, and that most do actually get rebated.
