Ronaldo's market value has decreased by 10 million to become 20 million euros in three months.
The main reason should be his not having much chance after starting to do his best to leave Manchester United. He hasn't played properly in the starting eleven for some time until the Europa League matches. I still don't expect him to be in the starting eleven in their next Premier League match. Actually his market value would still decrease slowly because of his age above all else. But his ineffective performance is helping his value to be lower quickly. Depending on his recent performance he has a less chance to find himself a club that is in the Champions League. So he needs to show a better performance to help Manchester United be a part of it next season.
What Ronaldo wants is not money, he already has everything when it comes to money. But he still insisted on wanting to play in the Champions League. For a Ronaldo, money is not everything but his prestige on the football stage must continue to shine. That is evidenced by his ambition that offers to every club that plays in the Champions League to be able to take it. Ronaldo doesn't want his reputation to be pursued by Messi, because currently, Messi is still productive and better than Ronaldo in his old age. Therefore Ronaldo was determined not to be left behind.