Ronaldo (as a brand and footballer) has transcended into a global phenomenon, You can't (and shouldn't) compare his commercial impact now to when he left for Madrid(2009) - it makes no sense.
Ronaldo still has a lot to offer and will do well to supplement our current squad, not to mention elevate our status as contenders not just on a national level, but continental, and ultimately world for the next 4 years. Which would be more than enough, really.
Considering he still has a lot to offer on the footballing side, and a hell of a lot more to offer on the commercial side, mixed with the sentimental value of the transfer - i fail to see how signing him for the reported fee(£60m), and even the fee you were responding to can be viewed as daft when it is going to have a substantial effect on our team for the next half decade.
Given his status as a commercial juggernaut, Madrid have every right to demand such an astronomical fee for his services, considering what they stand to lose. It is up to us to weigh our options and ultimately decide if he is worth that much, and judging by the proliferation of reports in recent weeks and the current situation in Madrid, i think we already have.