I guess the difference between the PS3 and PSP-Go from a marketing/tactic prospective is that the PSP-3000 is still on sale and supported. The PSP-Go wouldn't have cost Sony anywhere near as much to develop as the PS3, so even it sells a few million, I would think it would make up the development costs once software sales are factored in. In all honesty I think the PSP-Go is simply an elaborate experiment into whether the public are willing to have a download only device. Plus compare it to the ipod touch, which certainly has no trouble selling, and the PSP-Go is quite reasonable value.
Another way of seeing it is as a lesson learnt from Microsoft. Microsoft has shown multiple SKU's at different price levels works for consoles, and Nintendo are showing the same with DS/DSi. Sony won't lose any PSP sales over the price of PSP-Go, as the PSP-3000 is still the same price. So they have nothing to lose, money to gain. Simple.







