well, that's Microsoft's business model for the 360
you get the console for a low price (probably under their full costs for producing, shipping and marketing the console - at least for '08) and in return they charge a bit more for their peripherals and services
for some key peripherals (that are in high demand ) like the HDD and the wireless adapter they afaik didn't even license a 3rd party product to make sure the business model works out for them (and it seems it does)
as Euphoria pointed out it's still a bit unsettling they block the HDD mods now though, because a good amount of people already adopted that method to be able to make full use of all of MS' services







