psp games are only 39.99 MSRP and some debut even lower i'm thinking the price would be more like MSRP, 49.99, or 54.99 since it would just be a strip with 5 or 6 buttons.
Psp can't capture a casual audience unless it starts to get more casual games. not that i don't think it hasn't any(patapon and locco rocco) but diversifying your library has never been a crime. An they need an increased 3rd party casual support.
If for the first few months of sales you don't sell the peripheral separate of the game you cut down on piracy. Once you've made money from the software (after 30 to 90) days they could get down to selling replacements. I know GH for the 360 started off with you not being able to buy the guitar separately.
While you may not be willing to buy excessive amounts of peripherals to play games i don't believe that is indicative of most, as all the things you are talking about seem to have sold pretty well regardless of the fact that some aren't even really needed(MK steering wheel, zapper)
