@Crashdamage Maybe they should use the N900 to get the attention of the customer base.
Apple was already popular because of its Ipods... one could argue that it was easier for them to dictate the way the Iphone was launched, as opposed to letting the providers make the rules.
Nokia could build interest with this "4th Step" and then gradually move towards the "unaltered" option with their subsequent maemo devices.
I guarantee you the N900 will sell much much less in the US if it is unsubsidized than it would otherwise, altered or not.