You have to look at it from the retailer's perspective. You have limited funds to purchase new product.
You can sell the PSP Go and make say a 15% margin and no accessories or games. That means you've tied up $220 to make $30.
Or you can try to sell something else, say a PS3 that makes the same 15% margin. That means you pay $255 to make $45. However you will be able to sell more games and accessories for a 30% margin. It only costs $25 more investment to buy another PS3 rather than a PSP Go and you can sell more profitable product in the future.
Which do you think is the better investment?
Anyone can guess. It takes no effort to throw out lots of predictions and have some of them be correct. You are not and wiser or better for having your guesses be right. Even a blind man can hit the bullseye.
