they are getting the same revenue yes slightly less but instead of over 3 years they get it right off the bat, so its three years worth of some1 paying a sub without having to wait 3 years, and there wont be enough takers for this to really do damage in the way your saying. Its only for the lifetime of the radio as, and any replacement is 50 bucks or soemthing close to that up to 3 replacements.
well siri canada is still rather new isnt it? when siri was new they did this deal alot more as well if i remember right.