I am a kid?
Letting my kids play on a computer is totally and utterly fine.. it just means I have to let totally imaginary and nonexistant people go on a computer which does exist. The only reason I actually ever bother my parents to get a computer to go on is when I want to go on the internet (as my parents don't want me having an internet conneciton in my bedroom which they can't watch me on all the time.)
I never have any problems installing games on my computer. That's what toilet and drinks breaks are for!
I can see the benefits though... but like I said, there's only one for me, and that isn't really a major selling point of the XBOX methinks.