I think Al Nassr are just using the money to try to get Ronaldo's signature and nothing more, they know if they offer him less then it won't interest him from the on set but with this kind of money on the line anyone including Ronaldo will have some thinking to do. Ronaldo mightn't have made that kind of money from playing but he did make it from other sources like endorsement and businesses that he is running so don't think that's too much money for Ronaldo.
In the case of a person like Cristiano Ronaldo, it is not going to be easy for him to get out of the lifestyle he is living right now, especially after the problem that he was involved in. But even if he does take a big pay cut, I don't think that he will have to give up life by becoming poor. That's because you have sleep money from other sources. As far as I know, he is still modeling and getting paid by various brands. Obviously, he has invested money in stocks. In other words, I don't think he'll have money problems. In addition, he has done almost everything there is to do in football. It would be better for him to get as much money as he can.